4453 Amit Bhattacharya 2012-09-11 [merge]
Merge from mysql-5.6 to trunk
added:
mysql-test/r/multi_table_upd_del_sj.result
mysql-test/t/multi_table_upd_del_sj.test
4452 Guilhem Bichot 2012-09-10
In semijoin materialization, once the tmp table has been filled,
records of inner tables should not be read (they are out-of-date);
detect this with Valgrind.
modified:
sql/sql_executor.cc
=== added file 'mysql-test/r/multi_table_upd_del_sj.result'
--- a/mysql-test/r/multi_table_upd_del_sj.result 1970-01-01 00:00:00 +0000
+++ b/mysql-test/r/multi_table_upd_del_sj.result 2012-09-11 08:30:28 +0000
@@ -0,0 +1,5727 @@
+CREATE TABLE class(class_num INT NOT NULL PRIMARY KEY, class_name VARCHAR(20)) ENGINE=INNODB;
+CREATE TABLE student(stu_name VARCHAR(20) NOT NULL PRIMARY KEY, stu_city VARCHAR(20), stu_id INT) ENGINE=INNODB;
+CREATE TABLE roster(ros_num INT NOT NULL PRIMARY KEY, class_num INT, stu_name VARCHAR(20), FOREIGN KEY fk1(class_num) REFERENCES class(class_num), FOREIGN KEY fk2(stu_name) REFERENCES student(stu_name)) ENGINE=INNODB;
+INSERT INTO class VALUES(1,'math'),(2,'science'),(3,'history'),(4,'geog');
+INSERT INTO student VALUES('amit','bangalore',1),('ashu','hyderabad',2),('sumit','kota',2),('rajdeep','bbsr',4);
+INSERT INTO roster VALUES(1,3,'amit'),(2,4,'amit'),(3, 1, 'ashu'),(4,3,'ashu'),(5,1,'sumit'),(6,4,'sumit');
+CREATE TABLE ot1(a INT) ENGINE=INNODB;
+CREATE TABLE ot2(a INT) ENGINE=INNODB;
+CREATE TABLE ot3(a INT) ENGINE=INNODB;
+CREATE TABLE it1(a INT) ENGINE=INNODB;
+CREATE TABLE it2(a INT) ENGINE=INNODB;
+CREATE TABLE it3(a INT) ENGINE=INNODB;
+INSERT INTO ot1 VALUES(0),(1),(2),(3),(4),(5),(6),(7);
+INSERT INTO ot2 VALUES(0),(2),(4),(6);
+INSERT INTO ot3 VALUES(0),(3),(6);
+INSERT INTO it1 VALUES(0),(1),(2),(3),(4),(5),(6),(7);
+INSERT INTO it2 VALUES(0),(2),(4),(6);
+INSERT INTO it3 VALUES(0),(3),(6);
+COMMIT;
+# The optimizer_switch is set to default. We are verifying the various supported JOIN types for SEMI-JOIN
+SET optimizer_switch=default;
+COMMIT;
+SET autocommit=off;
+EXPLAIN EXTENDED UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk1 fk1 5 test.roster.class_num 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using where; Using index; LooseScan
+1 SIMPLE roster ref fk1 fk1 5 test.roster.class_num 1 100.00 Using index
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE student JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk2 fk2 23 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE student ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk2 fk2 23 test.roster.stu_name 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE student JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE roster.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk2 fk2 23 NULL 6 100.00 Using where; Using index; LooseScan
+1 SIMPLE roster ref fk2 fk2 23 test.roster.stu_name 1 100.00 Using index
+1 SIMPLE student ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE LOW_PRIORITY class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk1 fk1 5 test.roster.class_num 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE IGNORE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using where; Using index; LooseScan
+1 SIMPLE roster ref fk1 fk1 5 test.roster.class_num 1 100.00 Using index
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE class RIGHT JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using where; Using index; LooseScan
+1 SIMPLE roster ref fk1 fk1 5 test.roster.class_num 1 100.00 Using index
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE student LEFT JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk2 fk2 23 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE student ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk2 fk2 23 test.roster.stu_name 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE class INNER JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk1 fk1 5 test.roster.class_num 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 NULL
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+2 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111
+WHERE COALESCE(ot2.a,0) IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 NULL
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+2 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE (ot1.a,ot2.a) IN (SELECT a,a FROM it3 ORDER BY 2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+2 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+EXPLAIN EXTENDED UPDATE ot1 JOIN ot2 ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery3> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 <subquery3>.a 1 100.00 NULL
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+3 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+2 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+EXPLAIN EXTENDED UPDATE ot1 JOIN ot2 ON ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery3> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 <subquery3>.a 1 100.00 NULL
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using join buffer (Block Nested Loop)
+3 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+2 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN (ot2 JOIN ot3 ON ot2.a=ot3.a) ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it1 ORDER BY a)
+SET ot1.a = 111
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery3> ALL NULL NULL NULL NULL NULL 0.00 NULL
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE it1 ALL NULL NULL NULL NULL 8 100.00 Using where; FirstMatch(ot1)
+1 SIMPLE ot3 ALL NULL NULL NULL NULL 3 100.00 Using where
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where
+3 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE student JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit kolkata 1
+ashu kolkata 2
+rajdeep bbsr 4
+sumit kolkata 2
+ROLLBACK;
+UPDATE student JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE roster.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit kolkata 1
+ashu kolkata 2
+rajdeep bbsr 4
+sumit kolkata 2
+ROLLBACK;
+UPDATE LOW_PRIORITY class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE IGNORE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE class RIGHT JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE student LEFT JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit kolkata 1
+ashu kolkata 2
+rajdeep bbsr 4
+sumit kolkata 2
+ROLLBACK;
+UPDATE class INNER JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111
+WHERE COALESCE(ot2.a,0) IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+111
+2
+111
+4
+111
+111
+111
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE (ot1.a,ot2.a) IN (SELECT a,a FROM it3 ORDER BY 2);
+SELECT * FROM ot1;
+a
+111
+1
+2
+3
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 JOIN ot2 ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+1
+2
+3
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 JOIN ot2 ON ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+222
+222
+222
+ROLLBACK;
+UPDATE ot1 LEFT JOIN (ot2 JOIN ot3 ON ot2.a=ot3.a) ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it1 ORDER BY a)
+SET ot1.a = 111
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+ROLLBACK;
+# The following queries would select Firstmatch based on the optimizer switch settings
+# Please note that some of the queries would still show Duplicate Weedout
+SET optimizer_switch='semijoin=on,firstmatch=on,materialization=off,loosescan=off,index_condition_pushdown=off,mrr=off';
+COMMIT;
+EXPLAIN EXTENDED UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 100.00 NULL
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED UPDATE class RIGHT JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using where; Using index
+1 SIMPLE roster ref fk1 fk1 5 test.roster.class_num 1 100.00 Using index; FirstMatch(roster)
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE student LEFT JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL PRIMARY NULL NULL NULL 4 100.00 NULL
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; FirstMatch(student)
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE class INNER JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 100.00 NULL
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111
+WHERE COALESCE(ot2.a,0) IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE (ot1.a,ot2.a) IN (SELECT a,a FROM it3 ORDER BY 2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 JOIN ot2 ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Using where; FirstMatch(ot1); Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 JOIN ot2 ON ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Using where; FirstMatch(ot1); Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN (ot2 JOIN ot3 ON ot2.a=ot3.a) ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it1 ORDER BY a)
+SET ot1.a = 111
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 NULL
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Using where; FirstMatch(ot1); Using join buffer (Block Nested Loop)
+1 SIMPLE it1 ALL NULL NULL NULL NULL 8 100.00 Using where; FirstMatch(it3)
+1 SIMPLE ot3 ALL NULL NULL NULL NULL 3 100.00 Using where
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where
+UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE class RIGHT JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE student LEFT JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit kolkata 1
+ashu kolkata 2
+rajdeep bbsr 4
+sumit kolkata 2
+ROLLBACK;
+UPDATE class INNER JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111
+WHERE COALESCE(ot2.a,0) IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+111
+2
+111
+4
+111
+111
+111
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE (ot1.a,ot2.a) IN (SELECT a,a FROM it3 ORDER BY 2);
+SELECT * FROM ot1;
+a
+111
+1
+2
+3
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 JOIN ot2 ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+1
+2
+3
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 JOIN ot2 ON ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+222
+222
+222
+ROLLBACK;
+UPDATE ot1 LEFT JOIN (ot2 JOIN ot3 ON ot2.a=ot3.a) ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it1 ORDER BY a)
+SET ot1.a = 111
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+ROLLBACK;
+# The following queries would select Materialize based on the optimizer switch settings
+# Please note that some of the queries would still show Duplicate Weedout
+SET optimizer_switch='semijoin=on,loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,materialization=on';
+COMMIT;
+EXPLAIN EXTENDED UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 100.00 Using where
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.class.class_num 1 100.00 NULL
+2 MATERIALIZED roster index fk1 fk1 5 NULL 6 100.00 Using index
+EXPLAIN EXTENDED UPDATE class RIGHT JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using where; Using index
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.roster.class_num 1 100.00 NULL
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+2 MATERIALIZED roster index fk1 fk1 5 NULL 6 100.00 Using index
+EXPLAIN EXTENDED UPDATE student LEFT JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL PRIMARY NULL NULL NULL 4 100.00 Using where
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 23 test.student.stu_name 1 100.00 NULL
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index
+2 MATERIALIZED roster index fk2 fk2 23 NULL 6 100.00 Using index
+EXPLAIN EXTENDED UPDATE class INNER JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 100.00 Using where
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.class.class_num 1 100.00 NULL
+2 MATERIALIZED roster index fk1 fk1 5 NULL 6 100.00 Using index
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 NULL
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+2 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111
+WHERE COALESCE(ot2.a,0) IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 NULL
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+2 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE (ot1.a,ot2.a) IN (SELECT a,a FROM it3 ORDER BY 2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+2 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+EXPLAIN EXTENDED UPDATE ot1 JOIN ot2 ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery3> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 <subquery3>.a 1 100.00 NULL
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+3 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+2 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+EXPLAIN EXTENDED UPDATE ot1 JOIN ot2 ON ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery3> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 <subquery3>.a 1 100.00 NULL
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using join buffer (Block Nested Loop)
+3 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+2 MATERIALIZED it3 ALL NULL NULL NULL NULL 3 100.00 NULL
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN (ot2 JOIN ot3 ON ot2.a=ot3.a) ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it1 ORDER BY a)
+SET ot1.a = 111
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE it1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot3 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE class RIGHT JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE student LEFT JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit kolkata 1
+ashu kolkata 2
+rajdeep bbsr 4
+sumit kolkata 2
+ROLLBACK;
+UPDATE class INNER JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111
+WHERE COALESCE(ot2.a,0) IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+111
+2
+111
+4
+111
+111
+111
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE (ot1.a,ot2.a) IN (SELECT a,a FROM it3 ORDER BY 2);
+SELECT * FROM ot1;
+a
+111
+1
+2
+3
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 JOIN ot2 ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+1
+2
+3
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 JOIN ot2 ON ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+222
+222
+222
+ROLLBACK;
+UPDATE ot1 LEFT JOIN (ot2 JOIN ot3 ON ot2.a=ot3.a) ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it1 ORDER BY a)
+SET ot1.a = 111
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+ROLLBACK;
+# The following queries would select Duplicate Weedout strategy based on the optimizer switch settings
+SET optimizer_switch='loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+EXPLAIN EXTENDED UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 100.00 NULL
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE class RIGHT JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using where; Using index; Start temporary
+1 SIMPLE roster ref fk1 fk1 5 test.roster.class_num 1 100.00 Using index; End temporary
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE student LEFT JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL PRIMARY NULL NULL NULL 4 100.00 NULL
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; Start temporary
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; End temporary
+EXPLAIN EXTENDED UPDATE class INNER JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 100.00 NULL
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111
+WHERE COALESCE(ot2.a,0) IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE (ot1.a,ot2.a) IN (SELECT a,a FROM it3 ORDER BY 2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 JOIN ot2 ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 JOIN ot2 ON ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN (ot2 JOIN ot3 ON ot2.a=ot3.a) ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it1 ORDER BY a)
+SET ot1.a = 111
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE it1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot3 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE class RIGHT JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE student LEFT JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit kolkata 1
+ashu kolkata 2
+rajdeep bbsr 4
+sumit kolkata 2
+ROLLBACK;
+UPDATE class INNER JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111
+WHERE COALESCE(ot2.a,0) IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+111
+2
+111
+4
+111
+111
+111
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE (ot1.a,ot2.a) IN (SELECT a,a FROM it3 ORDER BY 2);
+SELECT * FROM ot1;
+a
+111
+1
+2
+3
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 JOIN ot2 ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+1
+2
+3
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 JOIN ot2 ON ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+222
+222
+222
+ROLLBACK;
+UPDATE ot1 LEFT JOIN (ot2 JOIN ot3 ON ot2.a=ot3.a) ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it1 ORDER BY a)
+SET ot1.a = 111
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+ROLLBACK;
+# The following queries would select Loosescan strategy based on the optimizer switch settings
+# Please note that some of the queries would still show Duplicate Weedout
+SET optimizer_switch='loosescan=on,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+EXPLAIN EXTENDED UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk1 fk1 5 test.roster.class_num 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE class RIGHT JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using where; Using index; LooseScan
+1 SIMPLE roster ref fk1 fk1 5 test.roster.class_num 1 100.00 Using index
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE student LEFT JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk2 fk2 23 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE student ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk2 fk2 23 test.roster.stu_name 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE class INNER JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk1 fk1 5 test.roster.class_num 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111
+WHERE COALESCE(ot2.a,0) IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE (ot1.a,ot2.a) IN (SELECT a,a FROM it3 ORDER BY 2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 JOIN ot2 ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 JOIN ot2 ON ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE ot1 LEFT JOIN (ot2 JOIN ot3 ON ot2.a=ot3.a) ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it1 ORDER BY a)
+SET ot1.a = 111
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE it3 ALL NULL NULL NULL NULL 3 100.00 Start temporary
+1 SIMPLE ot1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE it1 ALL NULL NULL NULL NULL 8 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot3 ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE ot2 ALL NULL NULL NULL NULL 4 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+UPDATE class JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE class RIGHT JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE student LEFT JOIN roster ON student.stu_name=roster.stu_name
+SET student.stu_city='kolkata'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit kolkata 1
+ashu kolkata 2
+rajdeep bbsr 4
+sumit kolkata 2
+ROLLBACK;
+UPDATE class INNER JOIN roster ON class.class_num=roster.class_num
+SET class.class_name='geography'
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111
+WHERE COALESCE(ot2.a,0) IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+111
+2
+111
+4
+111
+111
+111
+ROLLBACK;
+UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+SET ot1.a = 111, ot2.a = 222
+WHERE (ot1.a,ot2.a) IN (SELECT a,a FROM it3 ORDER BY 2);
+SELECT * FROM ot1;
+a
+111
+1
+2
+3
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 JOIN ot2 ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+1
+2
+3
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+2
+4
+222
+ROLLBACK;
+UPDATE ot1 JOIN ot2 ON ot1.a IN (SELECT a FROM it3)
+SET ot1.a = 111, ot2.a = 222
+WHERE ot1.a IN (SELECT a FROM it3);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+SELECT * FROM ot2;
+a
+222
+222
+222
+222
+ROLLBACK;
+UPDATE ot1 LEFT JOIN (ot2 JOIN ot3 ON ot2.a=ot3.a) ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it1 ORDER BY a)
+SET ot1.a = 111
+WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+SELECT * FROM ot1;
+a
+111
+1
+2
+111
+4
+5
+111
+7
+ROLLBACK;
+# The following queries would give various strategies based on the default optimizer switch settings
+SET optimizer_switch=default;
+COMMIT;
+EXPLAIN EXTENDED UPDATE class, roster
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster ORDER BY ros_num);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 100.00 NULL
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index; FirstMatch(class)
+1 SIMPLE roster index NULL fk1 5 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE class INNER JOIN roster ON class.class_num = roster.class_num
+AND class.class_name = 'history' OR class.class_name = 'math'
+ SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster ORDER BY ros_num);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 75.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster index fk1 fk1 5 NULL 6 100.00 Using where; Using index; Using join buffer (Block Nested Loop)
+UPDATE class, roster
+SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster ORDER BY ros_num);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+UPDATE class INNER JOIN roster ON class.class_num = roster.class_num
+AND class.class_name = 'history' OR class.class_name = 'math'
+ SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster ORDER BY ros_num);
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geog
+ROLLBACK;
+# Using IN subquery predicate in the ON clause of the JOIN
+EXPLAIN EXTENDED UPDATE class JOIN roster ON class.class_num IN (SELECT class_num from roster ORDER BY ros_num)
+SET class.class_name='geography';
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL PRIMARY NULL NULL NULL 4 100.00 NULL
+1 SIMPLE roster ref fk1 fk1 5 test.class.class_num 1 100.00 Using index; FirstMatch(class)
+1 SIMPLE roster index NULL fk1 5 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+UPDATE class JOIN roster ON class.class_num IN (SELECT class_num from roster ORDER BY ros_num)
+SET class.class_name='geography';
+SELECT * FROM class;
+class_num class_name
+1 geography
+2 science
+3 geography
+4 geography
+ROLLBACK;
+# The following set of tables are created to verify JOINS between 3 tables
+CREATE TABLE tx(c1 INT NOT NULL PRIMARY KEY, c2 INT) ENGINE=INNODB;
+CREATE TABLE ty(c1 INT, c2 INT, c3 VARCHAR(20) NOT NULL PRIMARY KEY, FOREIGN KEY fk1(c1) REFERENCES tx(c1)) ENGINE=INNODB;
+CREATE TABLE tz(c1 INT, c2 INT, c3 VARCHAR(20), FOREIGN KEY fk2(c3) REFERENCES ty(c3)) ENGINE=INNODB;
+INSERT INTO tx VALUES(1,1),(2,2),(3,3),(4,4),(5,5);
+INSERT INTO ty VALUES(1,1,'1 match tx'),(2,2,'2 match tx'),(4,4,'4 match tx');
+INSERT INTO tz VALUES(2,2,'2 match tx'),(4,4,'4 match tx');
+INSERT INTO tz VALUES(20,20,'2 match tx'),(40,40,'4 match tx');
+INSERT INTO tz VALUES(200,200,'2 match tx'),(400,400,'4 match tx');
+COMMIT;
+# Verifying various variations of the JOIN syntax using 3 tables
+EXPLAIN EXTENDED UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2) ORDER BY c1);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 <subquery2>.c2 1 100.00 NULL
+1 SIMPLE ty ref PRIMARY,fk1 fk1 5 <subquery2>.c2 1 100.00 Using index
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+2 MATERIALIZED ty ALL PRIMARY NULL NULL NULL 3 100.00 NULL
+2 MATERIALIZED tz ALL fk2 NULL NULL NULL 6 83.33 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE tx JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 <subquery2>.c2 1 100.00 NULL
+1 SIMPLE ty ref fk1 fk1 5 <subquery2>.c2 1 100.00 Using index
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+2 MATERIALIZED ty ALL PRIMARY NULL NULL NULL 3 100.00 NULL
+2 MATERIALIZED tz ALL fk2 NULL NULL NULL 6 83.33 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE tx JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c1 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2) ORDER BY c2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty index PRIMARY,fk1 fk1 5 NULL 3 100.00 Using where; Using index; Start temporary
+1 SIMPLE ty ref fk1 fk1 5 test.ty.c1 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 NULL
+1 SIMPLE tz ALL fk2 NULL NULL NULL 6 83.33 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+EXPLAIN EXTENDED UPDATE tx JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 <subquery2>.c2 1 100.00 NULL
+1 SIMPLE ty ref fk1 fk1 5 <subquery2>.c2 1 100.00 Using index
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+2 MATERIALIZED ty ALL PRIMARY NULL NULL NULL 3 100.00 NULL
+2 MATERIALIZED tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+EXPLAIN EXTENDED UPDATE tx INNER JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz ORDER BY c2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 <subquery2>.c2 1 100.00 NULL
+1 SIMPLE ty ref fk1 fk1 5 <subquery2>.c2 1 100.00 Using index
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+2 MATERIALIZED ty ALL PRIMARY NULL NULL NULL 3 100.00 NULL
+2 MATERIALIZED tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+EXPLAIN EXTENDED UPDATE tx,ty,tz
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2 ORDER BY c2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty index NULL fk1 5 NULL 3 100.00 Using index; Start temporary
+1 SIMPLE ty ALL PRIMARY NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 NULL
+1 SIMPLE tz ALL fk2 NULL NULL NULL 6 83.33 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE tz index NULL fk2 23 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE tx,ty,tz
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty index NULL fk1 5 NULL 3 100.00 Using index; Start temporary
+1 SIMPLE ty ALL PRIMARY NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 NULL
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index; End temporary
+1 SIMPLE tz index NULL fk2 23 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2) ORDER BY c1);
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+UPDATE tx JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2));
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+UPDATE tx JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c1 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2) ORDER BY c2);
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+UPDATE tx JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz));
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+UPDATE tx INNER JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz ORDER BY c2));
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+UPDATE tx,ty,tz
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2 ORDER BY c2));
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+UPDATE tx,ty,tz
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz));
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+# The following queries have JOIN syntax within the IN sub-query
+EXPLAIN EXTENDED UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT ty.c2 from ty,tz WHERE ty.c3 = tz.c3 and tz.c2 > 2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 <subquery2>.c2 1 100.00 NULL
+1 SIMPLE ty ref PRIMARY,fk1 fk1 5 <subquery2>.c2 1 100.00 Using index
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+2 MATERIALIZED ty ALL PRIMARY NULL NULL NULL 3 100.00 NULL
+2 MATERIALIZED tz ALL fk2 NULL NULL NULL 6 83.33 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT ty.c2 from ty JOIN tz ON ty.c3 = tz.c3 and tz.c2 > 2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 <subquery2>.c2 1 100.00 NULL
+1 SIMPLE ty ref PRIMARY,fk1 fk1 5 <subquery2>.c2 1 100.00 Using index
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+2 MATERIALIZED ty ALL PRIMARY NULL NULL NULL 3 100.00 NULL
+2 MATERIALIZED tz ALL fk2 NULL NULL NULL 6 83.33 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT ty.c2 from ty INNER JOIN tz ON ty.c3 = tz.c3 and tz.c2 > 2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 <subquery2>.c2 1 100.00 NULL
+1 SIMPLE ty ref PRIMARY,fk1 fk1 5 <subquery2>.c2 1 100.00 Using index
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+2 MATERIALIZED ty ALL PRIMARY NULL NULL NULL 3 100.00 NULL
+2 MATERIALIZED tz ALL fk2 NULL NULL NULL 6 83.33 Using where; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT ty.c2 from ty LEFT JOIN tz ON ty.c3 = tz.c3 and tz.c2 > 2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty ALL NULL NULL NULL NULL 3 100.00 Using where; Start temporary
+1 SIMPLE ty ref PRIMARY,fk1 fk1 5 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 NULL
+1 SIMPLE tz ALL fk2 NULL NULL NULL 6 83.33 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+EXPLAIN EXTENDED UPDATE tx INNER JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty) AND tx.c1 IN(SELECT c2 from tz);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty ALL NULL NULL NULL NULL 3 100.00 Using where; Start temporary
+1 SIMPLE ty ref fk1 fk1 5 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 End temporary
+1 SIMPLE tz ALL NULL NULL NULL NULL 6 100.00 Using where; FirstMatch(tx); Using join buffer (Block Nested Loop)
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 Using index
+UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT ty.c2 from ty,tz WHERE ty.c3 = tz.c3 and tz.c2 > 2);
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT ty.c2 from ty JOIN tz ON ty.c3 = tz.c3 and tz.c2 > 2);
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT ty.c2 from ty INNER JOIN tz ON ty.c3 = tz.c3 and tz.c2 > 2);
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT ty.c2 from ty LEFT JOIN tz ON ty.c3 = tz.c3 and tz.c2 > 2);
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+UPDATE tx INNER JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100
+WHERE tx.c1 IN(SELECT c2 from ty) AND tx.c1 IN(SELECT c2 from tz);
+SELECT * FROM tx;
+c1 c2
+1 1
+2 100
+3 3
+4 100
+5 5
+ROLLBACK;
+# Updating columns from more than 1 table
+EXPLAIN EXTENDED UPDATE tx,ty,tz
+SET tx.c2=100,tz.c2=101
+WHERE tx.c1 IN(SELECT c2 from ty);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty index NULL fk1 5 NULL 3 100.00 Using index
+1 SIMPLE <subquery2> ALL NULL NULL NULL NULL NULL 0.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 <subquery2>.c2 1 100.00 NULL
+1 SIMPLE tz ALL NULL NULL NULL NULL 6 100.00 Using join buffer (Block Nested Loop)
+2 MATERIALIZED ty ALL NULL NULL NULL NULL 3 100.00 NULL
+EXPLAIN EXTENDED UPDATE tx INNER JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100,tz.c2=101
+WHERE tx.c1 IN(SELECT c2 from ty);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty ALL NULL NULL NULL NULL 3 100.00 Using where; Start temporary
+1 SIMPLE ty ref fk1 fk1 5 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 End temporary
+1 SIMPLE tz ALL fk2 NULL NULL NULL 6 83.33 Using where; Using join buffer (Block Nested Loop)
+UPDATE tx,ty,tz
+SET tx.c2=100,tz.c2=101
+WHERE tx.c1 IN(SELECT c2 from ty);
+SELECT * FROM tx;
+c1 c2
+1 100
+2 100
+3 3
+4 100
+5 5
+SELECT * FROM tz;
+c1 c2 c3
+2 101 2 match tx
+4 101 4 match tx
+20 101 2 match tx
+40 101 4 match tx
+200 101 2 match tx
+400 101 4 match tx
+ROLLBACK;
+UPDATE tx INNER JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+SET tx.c2=100,tz.c2=101
+WHERE tx.c1 IN(SELECT c2 from ty);
+SELECT * FROM tx;
+c1 c2
+1 100
+2 100
+3 3
+4 100
+5 5
+SELECT * FROM tz;
+c1 c2 c3
+2 101 2 match tx
+4 101 4 match tx
+20 101 2 match tx
+40 101 4 match tx
+200 101 2 match tx
+400 101 4 match tx
+ROLLBACK;
+# Testing multi-table DELETE
+ALTER TABLE roster DROP FOREIGN KEY roster_ibfk_1;
+ALTER TABLE roster DROP FOREIGN KEY roster_ibfk_2;
+ALTER TABLE roster DROP PRIMARY KEY;
+ALTER TABLE class DROP PRIMARY KEY;
+ALTER TABLE student DROP PRIMARY KEY;
+ALTER TABLE roster ADD KEY(class_num);
+# The optimizer_switch is set to default. We are verifying the various supported JOIN types for SEMI-JOIN
+SET optimizer_switch=default;
+COMMIT;
+EXPLAIN EXTENDED DELETE class FROM class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index class_num class_num 5 NULL 1 100.00 Using where; Using index
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.roster.class_num 1 100.00 Using index; FirstMatch(class)
+EXPLAIN EXTENDED DELETE LOW_PRIORITY FROM class USING class INNER JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED DELETE QUICK FROM class USING class LEFT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; FirstMatch(class)
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+EXPLAIN EXTENDED DELETE IGNORE FROM class USING class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED DELETE class FROM class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster index NULL class_num 5 NULL 1 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED DELETE FROM class USING class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster index NULL class_num 5 NULL 1 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED DELETE student FROM student LEFT JOIN roster
+ON student.stu_name=roster.stu_name
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; FirstMatch(student)
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index
+EXPLAIN EXTENDED DELETE student FROM student INNER JOIN roster INNER JOIN class
+ON student.stu_name=roster.stu_name AND roster.class_num = class.class_num AND stu_city = 'bbsr'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk2,class_num fk2 23 test.student.stu_name 1 100.00 Using where
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED DELETE tz FROM tz JOIN ty
+ON tz.c3=ty.c3 JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Start temporary
+1 SIMPLE ty ref PRIMARY,fk1 fk1 5 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using where; End temporary
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 NULL
+EXPLAIN EXTENDED DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Start temporary
+1 SIMPLE ty ref PRIMARY,fk1 fk1 5 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using where; End temporary
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 NULL
+EXPLAIN EXTENDED DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Start temporary
+1 SIMPLE ty ref PRIMARY,fk1 fk1 5 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index; End temporary
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 NULL
+EXPLAIN EXTENDED DELETE FROM tz USING tz INNER JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Start temporary
+1 SIMPLE ty ref PRIMARY,fk1 fk1 5 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index; End temporary
+1 SIMPLE tz ref fk2 fk2 23 test.ty.c3 3 100.00 NULL
+EXPLAIN EXTENDED DELETE tz FROM tx,ty,tz
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE ty index NULL fk1 5 NULL 3 100.00 Using index; Start temporary
+1 SIMPLE ty ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx ALL NULL NULL NULL NULL 5 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE tz ALL NULL NULL NULL NULL 6 100.00 Using join buffer (Block Nested Loop)
+Warnings:
+Note 1276 Field or reference 'test.ty.c3' of SELECT #3 was resolved in SELECT #2
+EXPLAIN EXTENDED DELETE tz FROM tx,ty,tz
+WHERE ty.c1 IN(SELECT c2 from tx WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tx ALL NULL NULL NULL NULL 5 100.00 Using where; Start temporary
+1 SIMPLE ty ref fk1 fk1 5 test.tx.c2 1 100.00 Using index
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.tx.c2 1 100.00 Using index; End temporary
+1 SIMPLE tx index NULL PRIMARY 4 NULL 5 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE tz ALL NULL NULL NULL NULL 6 100.00 Using join buffer (Block Nested Loop)
+Warnings:
+Note 1276 Field or reference 'test.ty.c1' of SELECT #2 was resolved in SELECT #1
+DELETE class FROM class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE LOW_PRIORITY FROM class USING class INNER JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE QUICK FROM class USING class LEFT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE IGNORE FROM class USING class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE class FROM class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE FROM class USING class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE student FROM student LEFT JOIN roster
+ON student.stu_name=roster.stu_name
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+rajdeep bbsr 4
+ROLLBACK;
+DELETE student FROM student INNER JOIN roster INNER JOIN class
+ON student.stu_name=roster.stu_name AND roster.class_num = class.class_num AND stu_city = 'bbsr'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit bangalore 1
+ashu hyderabad 2
+rajdeep bbsr 4
+sumit kota 2
+ROLLBACK;
+DELETE tz FROM tz JOIN ty
+ON tz.c3=ty.c3 JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+2 2 2 match tx
+20 20 2 match tx
+200 200 2 match tx
+ROLLBACK;
+DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+2 2 2 match tx
+20 20 2 match tx
+200 200 2 match tx
+ROLLBACK;
+DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE FROM tz USING tz INNER JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE tz FROM tx,ty,tz
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE tz FROM tx,ty,tz
+WHERE ty.c1 IN(SELECT c2 from tx WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+# The following queries would select Firstmatch based on the optimizer switch settings
+# Please note that some of the queries would still show Duplicate Weedout
+SET optimizer_switch='semijoin=on,firstmatch=on,materialization=off,loosescan=off,index_condition_pushdown=off,mrr=off';
+COMMIT;
+EXPLAIN EXTENDED DELETE class FROM class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index class_num class_num 5 NULL 1 100.00 Using where; Using index
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.roster.class_num 1 100.00 Using index; FirstMatch(class)
+EXPLAIN EXTENDED DELETE LOW_PRIORITY FROM class USING class INNER JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED DELETE QUICK FROM class USING class LEFT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; FirstMatch(class)
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+EXPLAIN EXTENDED DELETE IGNORE FROM class USING class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED DELETE class FROM class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster index NULL class_num 5 NULL 1 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED DELETE FROM class USING class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster index NULL class_num 5 NULL 1 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED DELETE student FROM student LEFT JOIN roster
+ON student.stu_name=roster.stu_name
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; FirstMatch(student)
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index
+EXPLAIN EXTENDED DELETE student FROM student INNER JOIN roster INNER JOIN class
+ON student.stu_name=roster.stu_name AND roster.class_num = class.class_num AND stu_city = 'bbsr'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk2,class_num fk2 23 test.student.stu_name 1 100.00 Using where
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; FirstMatch(roster)
+EXPLAIN EXTENDED DELETE tz FROM tz JOIN ty
+ON tz.c3=ty.c3 JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using where; FirstMatch(tx)
+EXPLAIN EXTENDED DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 NULL
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using where; FirstMatch(tx)
+EXPLAIN EXTENDED DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 NULL
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index; FirstMatch(tx)
+EXPLAIN EXTENDED DELETE FROM tz USING tz INNER JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 NULL
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index; FirstMatch(tx)
+EXPLAIN EXTENDED DELETE tz FROM tx,ty,tz
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL NULL NULL NULL NULL 1 100.00 Start temporary
+1 SIMPLE ty index NULL fk1 5 NULL 3 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE ty ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx ALL NULL NULL NULL NULL 5 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+Warnings:
+Note 1276 Field or reference 'test.ty.c3' of SELECT #3 was resolved in SELECT #2
+EXPLAIN EXTENDED DELETE tz FROM tx,ty,tz
+WHERE ty.c1 IN(SELECT c2 from tx WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE ty index fk1 fk1 5 NULL 3 100.00 Using where; Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE tx ALL NULL NULL NULL NULL 5 100.00 Using where; FirstMatch(tx); Using join buffer (Block Nested Loop)
+1 SIMPLE tx index NULL PRIMARY 4 NULL 5 100.00 Using index; Using join buffer (Block Nested Loop)
+Warnings:
+Note 1276 Field or reference 'test.ty.c1' of SELECT #2 was resolved in SELECT #1
+DELETE class FROM class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE LOW_PRIORITY FROM class USING class INNER JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE QUICK FROM class USING class LEFT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE IGNORE FROM class USING class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE class FROM class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE FROM class USING class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE student FROM student LEFT JOIN roster
+ON student.stu_name=roster.stu_name
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+rajdeep bbsr 4
+ROLLBACK;
+DELETE student FROM student INNER JOIN roster INNER JOIN class
+ON student.stu_name=roster.stu_name AND roster.class_num = class.class_num AND stu_city = 'bbsr'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit bangalore 1
+ashu hyderabad 2
+rajdeep bbsr 4
+sumit kota 2
+ROLLBACK;
+DELETE tz FROM tz JOIN ty
+ON tz.c3=ty.c3 JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+2 2 2 match tx
+20 20 2 match tx
+200 200 2 match tx
+ROLLBACK;
+DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+2 2 2 match tx
+20 20 2 match tx
+200 200 2 match tx
+ROLLBACK;
+DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE FROM tz USING tz INNER JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE tz FROM tx,ty,tz
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE tz FROM tx,ty,tz
+WHERE ty.c1 IN(SELECT c2 from tx WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+# The following queries would select Materialize based on the optimizer switch settings
+# Please note that some of the queries would still show Duplicate Weedout
+SET optimizer_switch='semijoin=on,loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,materialization=on';
+COMMIT;
+EXPLAIN EXTENDED DELETE class FROM class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index class_num class_num 5 NULL 1 100.00 Using where; Using index
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.roster.class_num 1 100.00 NULL
+2 MATERIALIZED roster index class_num class_num 5 NULL 1 100.00 Using index
+EXPLAIN EXTENDED DELETE LOW_PRIORITY FROM class USING class INNER JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.class.class_num 1 100.00 NULL
+2 MATERIALIZED roster index class_num class_num 5 NULL 1 100.00 Using index
+EXPLAIN EXTENDED DELETE QUICK FROM class USING class LEFT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; Start temporary
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; End temporary
+EXPLAIN EXTENDED DELETE IGNORE FROM class USING class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.class.class_num 1 100.00 NULL
+2 MATERIALIZED roster index class_num class_num 5 NULL 1 100.00 Using index
+EXPLAIN EXTENDED DELETE class FROM class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE roster index NULL class_num 5 NULL 1 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.class.class_num 1 100.00 NULL
+2 MATERIALIZED roster index class_num class_num 5 NULL 1 100.00 Using index
+EXPLAIN EXTENDED DELETE FROM class USING class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE roster index NULL class_num 5 NULL 1 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.class.class_num 1 100.00 NULL
+2 MATERIALIZED roster index class_num class_num 5 NULL 1 100.00 Using index
+EXPLAIN EXTENDED DELETE student FROM student LEFT JOIN roster
+ON student.stu_name=roster.stu_name
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; Start temporary
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; End temporary
+EXPLAIN EXTENDED DELETE student FROM student INNER JOIN roster INNER JOIN class
+ON student.stu_name=roster.stu_name AND roster.class_num = class.class_num AND stu_city = 'bbsr'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk2,class_num fk2 23 test.student.stu_name 1 100.00 Using where
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 23 test.student.stu_name 1 100.00 NULL
+2 MATERIALIZED roster index fk2 fk2 23 NULL 1 100.00 Using index
+EXPLAIN EXTENDED DELETE tz FROM tz JOIN ty
+ON tz.c3=ty.c3 JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.ty.c1 1 100.00 NULL
+2 MATERIALIZED ty ALL fk1 NULL NULL NULL 3 100.00 Using where
+2 MATERIALIZED tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using where
+EXPLAIN EXTENDED DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.ty.c1 1 100.00 NULL
+2 MATERIALIZED ty ALL fk1 NULL NULL NULL 3 100.00 Using where
+2 MATERIALIZED tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using where
+EXPLAIN EXTENDED DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.ty.c1 1 100.00 NULL
+2 MATERIALIZED ty ALL fk1 NULL NULL NULL 3 100.00 Using where
+2 MATERIALIZED tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+EXPLAIN EXTENDED DELETE FROM tz USING tz INNER JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE <subquery2> eq_ref <auto_key> <auto_key> 5 test.ty.c1 1 100.00 NULL
+2 MATERIALIZED ty ALL fk1 NULL NULL NULL 3 100.00 Using where
+2 MATERIALIZED tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+EXPLAIN EXTENDED DELETE tz FROM tx,ty,tz
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL NULL NULL NULL NULL 1 100.00 Start temporary
+1 SIMPLE ty index NULL fk1 5 NULL 3 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE ty ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx ALL NULL NULL NULL NULL 5 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+Warnings:
+Note 1276 Field or reference 'test.ty.c3' of SELECT #3 was resolved in SELECT #2
+EXPLAIN EXTENDED DELETE tz FROM tx,ty,tz
+WHERE ty.c1 IN(SELECT c2 from tx WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL NULL NULL NULL NULL 1 100.00 Start temporary
+1 SIMPLE ty index fk1 fk1 5 NULL 3 100.00 Using where; Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE tx ALL NULL NULL NULL NULL 5 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE tx index NULL PRIMARY 4 NULL 5 100.00 Using index; Using join buffer (Block Nested Loop)
+Warnings:
+Note 1276 Field or reference 'test.ty.c1' of SELECT #2 was resolved in SELECT #1
+DELETE class FROM class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE LOW_PRIORITY FROM class USING class INNER JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE QUICK FROM class USING class LEFT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE IGNORE FROM class USING class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE class FROM class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE FROM class USING class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE student FROM student LEFT JOIN roster
+ON student.stu_name=roster.stu_name
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+rajdeep bbsr 4
+ROLLBACK;
+DELETE student FROM student INNER JOIN roster INNER JOIN class
+ON student.stu_name=roster.stu_name AND roster.class_num = class.class_num AND stu_city = 'bbsr'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit bangalore 1
+ashu hyderabad 2
+rajdeep bbsr 4
+sumit kota 2
+ROLLBACK;
+DELETE tz FROM tz JOIN ty
+ON tz.c3=ty.c3 JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+2 2 2 match tx
+20 20 2 match tx
+200 200 2 match tx
+ROLLBACK;
+DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+2 2 2 match tx
+20 20 2 match tx
+200 200 2 match tx
+ROLLBACK;
+DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE FROM tz USING tz INNER JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE tz FROM tx,ty,tz
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE tz FROM tx,ty,tz
+WHERE ty.c1 IN(SELECT c2 from tx WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+# The following queries would select Duplicate Weedout strategy based on the optimizer switch settings
+SET optimizer_switch='loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+EXPLAIN EXTENDED DELETE class FROM class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index class_num class_num 5 NULL 1 100.00 Using where; Using index
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.roster.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE LOW_PRIORITY FROM class USING class INNER JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE QUICK FROM class USING class LEFT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; Start temporary
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; End temporary
+EXPLAIN EXTENDED DELETE IGNORE FROM class USING class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE class FROM class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster index NULL class_num 5 NULL 1 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE FROM class USING class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster index NULL class_num 5 NULL 1 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE student FROM student LEFT JOIN roster
+ON student.stu_name=roster.stu_name
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; Start temporary
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; End temporary
+EXPLAIN EXTENDED DELETE student FROM student INNER JOIN roster INNER JOIN class
+ON student.stu_name=roster.stu_name AND roster.class_num = class.class_num AND stu_city = 'bbsr'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk2,class_num fk2 23 test.student.stu_name 1 100.00 Using where
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE tz FROM tz JOIN ty
+ON tz.c3=ty.c3 JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where; Start temporary
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using where; End temporary
+EXPLAIN EXTENDED DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where; Start temporary
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 NULL
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using where; End temporary
+EXPLAIN EXTENDED DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where; Start temporary
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 NULL
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index; End temporary
+EXPLAIN EXTENDED DELETE FROM tz USING tz INNER JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where; Start temporary
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 NULL
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index; End temporary
+EXPLAIN EXTENDED DELETE tz FROM tx,ty,tz
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL NULL NULL NULL NULL 1 100.00 Start temporary
+1 SIMPLE ty index NULL fk1 5 NULL 3 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE ty ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx ALL NULL NULL NULL NULL 5 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+Warnings:
+Note 1276 Field or reference 'test.ty.c3' of SELECT #3 was resolved in SELECT #2
+EXPLAIN EXTENDED DELETE tz FROM tx,ty,tz
+WHERE ty.c1 IN(SELECT c2 from tx WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL NULL NULL NULL NULL 1 100.00 Start temporary
+1 SIMPLE ty index fk1 fk1 5 NULL 3 100.00 Using where; Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE tx ALL NULL NULL NULL NULL 5 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE tx index NULL PRIMARY 4 NULL 5 100.00 Using index; Using join buffer (Block Nested Loop)
+Warnings:
+Note 1276 Field or reference 'test.ty.c1' of SELECT #2 was resolved in SELECT #1
+DELETE class FROM class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE LOW_PRIORITY FROM class USING class INNER JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE QUICK FROM class USING class LEFT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE IGNORE FROM class USING class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE class FROM class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE FROM class USING class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE student FROM student LEFT JOIN roster
+ON student.stu_name=roster.stu_name
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+rajdeep bbsr 4
+ROLLBACK;
+DELETE student FROM student INNER JOIN roster INNER JOIN class
+ON student.stu_name=roster.stu_name AND roster.class_num = class.class_num AND stu_city = 'bbsr'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit bangalore 1
+ashu hyderabad 2
+rajdeep bbsr 4
+sumit kota 2
+ROLLBACK;
+DELETE tz FROM tz JOIN ty
+ON tz.c3=ty.c3 JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+2 2 2 match tx
+20 20 2 match tx
+200 200 2 match tx
+ROLLBACK;
+DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+2 2 2 match tx
+20 20 2 match tx
+200 200 2 match tx
+ROLLBACK;
+DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE FROM tz USING tz INNER JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE tz FROM tx,ty,tz
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE tz FROM tx,ty,tz
+WHERE ty.c1 IN(SELECT c2 from tx WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+# The following queries would select Loosescan strategy based on the optimizer switch settings
+# Please note that some of the queries would still show Duplicate Weedout
+SET optimizer_switch='loosescan=on,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+EXPLAIN EXTENDED DELETE class FROM class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE roster index class_num class_num 5 NULL 1 100.00 Using where; Using index
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.roster.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE LOW_PRIORITY FROM class USING class INNER JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE QUICK FROM class USING class LEFT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; Start temporary
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; End temporary
+EXPLAIN EXTENDED DELETE IGNORE FROM class USING class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE class FROM class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster index NULL class_num 5 NULL 1 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE FROM class USING class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster index NULL class_num 5 NULL 1 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref class_num class_num 5 test.class.class_num 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE student FROM student LEFT JOIN roster
+ON student.stu_name=roster.stu_name
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; Start temporary
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; End temporary
+EXPLAIN EXTENDED DELETE student FROM student INNER JOIN roster INNER JOIN class
+ON student.stu_name=roster.stu_name AND roster.class_num = class.class_num AND stu_city = 'bbsr'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE student ALL NULL NULL NULL NULL 1 100.00 Using where
+1 SIMPLE class ALL NULL NULL NULL NULL 1 100.00 Using join buffer (Block Nested Loop)
+1 SIMPLE roster ref fk2,class_num fk2 23 test.student.stu_name 1 100.00 Using where
+1 SIMPLE roster ref fk2 fk2 23 test.student.stu_name 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE tz FROM tz JOIN ty
+ON tz.c3=ty.c3 JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where; Start temporary
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 Using where
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using where; End temporary
+EXPLAIN EXTENDED DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where; Start temporary
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 NULL
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using where; End temporary
+EXPLAIN EXTENDED DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where; Start temporary
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 NULL
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index; End temporary
+EXPLAIN EXTENDED DELETE FROM tz USING tz INNER JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL fk2 NULL NULL NULL 1 100.00 Using where; Start temporary
+1 SIMPLE ty eq_ref PRIMARY,fk1 PRIMARY 22 test.tz.c3 1 100.00 NULL
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE ty ALL fk1 NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index; End temporary
+EXPLAIN EXTENDED DELETE tz FROM tx,ty,tz
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tx WHERE c2>2));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL NULL NULL NULL NULL 1 100.00 Start temporary
+1 SIMPLE ty index NULL fk1 5 NULL 3 100.00 Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE ty ALL NULL NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c2 1 100.00 Using index
+1 SIMPLE tx ALL NULL NULL NULL NULL 5 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+Warnings:
+Note 1276 Field or reference 'test.ty.c3' of SELECT #3 was resolved in SELECT #2
+EXPLAIN EXTENDED DELETE tz FROM tx,ty,tz
+WHERE ty.c1 IN(SELECT c2 from tx WHERE ty.c1 IN(SELECT c1 from tx));
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tz ALL NULL NULL NULL NULL 1 100.00 Start temporary
+1 SIMPLE ty index fk1 fk1 5 NULL 3 100.00 Using where; Using index; Using join buffer (Block Nested Loop)
+1 SIMPLE tx eq_ref PRIMARY PRIMARY 4 test.ty.c1 1 100.00 Using index
+1 SIMPLE tx ALL NULL NULL NULL NULL 5 100.00 Using where; End temporary; Using join buffer (Block Nested Loop)
+1 SIMPLE tx index NULL PRIMARY 4 NULL 5 100.00 Using index; Using join buffer (Block Nested Loop)
+Warnings:
+Note 1276 Field or reference 'test.ty.c1' of SELECT #2 was resolved in SELECT #1
+DELETE class FROM class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE roster.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE LOW_PRIORITY FROM class USING class INNER JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE QUICK FROM class USING class LEFT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE IGNORE FROM class USING class RIGHT JOIN roster
+ON class.class_num=roster.class_num
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE class FROM class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE FROM class USING class, roster
+WHERE class.class_num IN (SELECT class_num FROM roster);
+SELECT * FROM class;
+class_num class_name
+2 science
+ROLLBACK;
+DELETE student FROM student LEFT JOIN roster
+ON student.stu_name=roster.stu_name
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+rajdeep bbsr 4
+ROLLBACK;
+DELETE student FROM student INNER JOIN roster INNER JOIN class
+ON student.stu_name=roster.stu_name AND roster.class_num = class.class_num AND stu_city = 'bbsr'
+WHERE student.stu_name IN (SELECT stu_name FROM roster);
+SELECT * FROM student;
+stu_name stu_city stu_id
+amit bangalore 1
+ashu hyderabad 2
+rajdeep bbsr 4
+sumit kota 2
+ROLLBACK;
+DELETE tz FROM tz JOIN ty
+ON tz.c3=ty.c3 JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+2 2 2 match tx
+20 20 2 match tx
+200 200 2 match tx
+ROLLBACK;
+DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+2 2 2 match tx
+20 20 2 match tx
+200 200 2 match tx
+ROLLBACK;
+DELETE FROM tz USING tz JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE FROM tz USING tz INNER JOIN ty
+ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE tz FROM tx,ty,tz
+WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tx WHERE c2>2));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+DELETE tz FROM tx,ty,tz
+WHERE ty.c1 IN(SELECT c2 from tx WHERE ty.c1 IN(SELECT c1 from tx));
+SELECT * FROM tz;
+c1 c2 c3
+ROLLBACK;
+# Drop the tables that were created
+DROP TABLE tz;
+DROP TABLE ty;
+DROP TABLE tx;
+DROP TABLE roster;
+DROP TABLE student;
+DROP TABLE class;
+COMMIT;
+# Verifying the feature with partitioned table
+CREATE TABLE emp (
+id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
+fname VARCHAR(25) NOT NULL,
+lname VARCHAR(25) NOT NULL,
+store_id INT NOT NULL,
+dept_id INT NOT NULL,
+KEY(dept_id)
+) ENGINE=INNODB
+PARTITION BY RANGE(id) (
+PARTITION p0 VALUES LESS THAN (5),
+PARTITION p1 VALUES LESS THAN (10),
+PARTITION p2 VALUES LESS THAN (15),
+PARTITION p3 VALUES LESS THAN MAXVALUE
+);
+CREATE TABLE dept (
+dept_id INT NOT NULL,
+dept_name varchar(25) NOT NULL,
+KEY(dept_id)
+) ENGINE=INNODB
+PARTITION BY RANGE(dept_id) (
+PARTITION p0 VALUES LESS THAN (3),
+PARTITION p1 VALUES LESS THAN (6),
+PARTITION p3 VALUES LESS THAN MAXVALUE
+);
+INSERT INTO emp(fname, lname, store_id, dept_id) VALUES
+('Bob', 'Taylor', 3, 2), ('Frank', 'Williams', 1, 2),
+('Ellen', 'Johnson', 3, 4), ('Jim', 'Smith', 2, 4),
+('Mary', 'Jones', 1, 1), ('Linda', 'Black', 2, 3),
+('Ed', 'Jones', 2, 1), ('June', 'Wilson', 3, 1),
+('Andy', 'Smith', 1, 3), ('Lou', 'Waters', 2, 4),
+('Jill', 'Stone', 1, 4), ('Roger', 'White', 3, 2),
+('Howard', 'Andrews', 1, 2), ('Fred', 'Goldberg', 3, 3),
+('Barbara', 'Brown', 2, 3), ('Alice', 'Rogers', 2, 2),
+('Mark', 'Morgan', 3, 3), ('Karen', 'Cole', 3, 2);
+INSERT INTO dept VALUES
+(1,'admin'),(2, 'finance'),
+(3,'IT'),(4, 'security'),
+(5,'ref'),(6,'services');
+COMMIT;
+# Verfying with partitioned tables keeping the default optimizer_switch settings
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept ALL dept_id NULL NULL NULL 2 100.00 Using where
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept ALL dept_id NULL NULL NULL 5 100.00 NULL
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 9 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using where
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using where; Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 9 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 4 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 Junk
+4 Junk
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 not SET not SET 500 2
+3 not SET not SET 500 4
+4 not SET not SET 500 4
+5 not SET not SET 500 1
+6 not SET not SET 500 3
+7 not SET not SET 500 1
+8 not SET not SET 500 1
+9 not SET not SET 500 3
+10 not SET not SET 500 4
+11 not SET not SET 500 4
+12 not SET not SET 500 2
+13 not SET not SET 500 2
+14 not SET not SET 500 3
+15 not SET not SET 500 3
+16 not SET not SET 500 2
+17 not SET not SET 500 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+ROLLBACK;
+DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+# Tables are partitioned, queries uses Firstmatch
+# Please note that some of the queries would still show Duplicate Weedout
+SET optimizer_switch='semijoin=on,firstmatch=on,materialization=off,loosescan=off,index_condition_pushdown=off,mrr=off';
+COMMIT;
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 Using where
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 4 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept ALL dept_id NULL NULL NULL 2 100.00 Using where
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index; FirstMatch(emp)
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept ALL dept_id NULL NULL NULL 5 100.00 NULL
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index; FirstMatch(emp)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(emp)
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 4 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 4 100.00 Using where
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(emp)
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using where; Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(emp)
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 Using where
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 4 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(emp)
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 4 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 Junk
+4 Junk
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 not SET not SET 500 2
+3 not SET not SET 500 4
+4 not SET not SET 500 4
+5 not SET not SET 500 1
+6 not SET not SET 500 3
+7 not SET not SET 500 1
+8 not SET not SET 500 1
+9 not SET not SET 500 3
+10 not SET not SET 500 4
+11 not SET not SET 500 4
+12 not SET not SET 500 2
+13 not SET not SET 500 2
+14 not SET not SET 500 3
+15 not SET not SET 500 3
+16 not SET not SET 500 2
+17 not SET not SET 500 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+ROLLBACK;
+DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+# Tables are partitioned, queries uses Materialization
+# Please note that some of the queries would still show Duplicate Weedout
+SET optimizer_switch='loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=on';
+COMMIT;
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 Using where
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 End temporary
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept ALL dept_id NULL NULL NULL 2 100.00 Using where
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp index dept_id dept_id 4 NULL 4 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 End temporary
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 End temporary
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using where; End temporary
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using where; Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 Using where
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 End temporary
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 End temporary
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 Junk
+4 Junk
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 not SET not SET 500 2
+3 not SET not SET 500 4
+4 not SET not SET 500 4
+5 not SET not SET 500 1
+6 not SET not SET 500 3
+7 not SET not SET 500 1
+8 not SET not SET 500 1
+9 not SET not SET 500 3
+10 not SET not SET 500 4
+11 not SET not SET 500 4
+12 not SET not SET 500 2
+13 not SET not SET 500 2
+14 not SET not SET 500 3
+15 not SET not SET 500 3
+16 not SET not SET 500 2
+17 not SET not SET 500 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+ROLLBACK;
+DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+# Tables are partitioned, queries uses Duplicate Weedout strategy
+SET optimizer_switch='loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 Using where
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 End temporary
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept ALL dept_id NULL NULL NULL 2 100.00 Using where
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp index dept_id dept_id 4 NULL 4 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 End temporary
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 End temporary
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using where; End temporary
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using where; Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 Using where
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 End temporary
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; Start temporary
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 End temporary
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 Junk
+4 Junk
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 not SET not SET 500 2
+3 not SET not SET 500 4
+4 not SET not SET 500 4
+5 not SET not SET 500 1
+6 not SET not SET 500 3
+7 not SET not SET 500 1
+8 not SET not SET 500 1
+9 not SET not SET 500 3
+10 not SET not SET 500 4
+11 not SET not SET 500 4
+12 not SET not SET 500 2
+13 not SET not SET 500 2
+14 not SET not SET 500 3
+15 not SET not SET 500 3
+16 not SET not SET 500 2
+17 not SET not SET 500 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+ROLLBACK;
+DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+# Tables are partitioned, queries uses Loosescan strategy
+# Please note that some of the queries would still show Duplicate Weedout
+SET optimizer_switch='loosescan=on,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using where; Using index; LooseScan
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp index dept_id dept_id 4 NULL 4 100.00 Using where; Using index; LooseScan
+1 SIMPLE dept ALL dept_id NULL NULL NULL 2 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE emp ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp index dept_id dept_id 4 NULL 4 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using where
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using where; Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using where; Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; Start temporary; End temporary
+EXPLAIN EXTENDED DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 Junk
+4 Junk
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 not SET not SET 500 2
+3 not SET not SET 500 4
+4 not SET not SET 500 4
+5 not SET not SET 500 1
+6 not SET not SET 500 3
+7 not SET not SET 500 1
+8 not SET not SET 500 1
+9 not SET not SET 500 3
+10 not SET not SET 500 4
+11 not SET not SET 500 4
+12 not SET not SET 500 2
+13 not SET not SET 500 2
+14 not SET not SET 500 3
+15 not SET not SET 500 3
+16 not SET not SET 500 2
+17 not SET not SET 500 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+ROLLBACK;
+DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+# Tables are partitioned, queries with default optimizer_switch settings
+SET optimizer_switch=default;
+COMMIT;
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 Using where
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept ALL dept_id NULL NULL NULL 2 100.00 Using where
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index; FirstMatch(emp)
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp index dept_id dept_id 4 NULL 4 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 NULL
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(emp)
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using where
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using where; Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 3 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(emp)
+1 SIMPLE dept index NULL dept_id 4 NULL 6 100.00 Using index; Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using where; Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE emp ALL dept_id NULL NULL NULL 2 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index
+1 SIMPLE dept ref dept_id dept_id 4 test.emp.dept_id 1 100.00 Using index; FirstMatch(dept)
+EXPLAIN EXTENDED DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+EXPLAIN EXTENDED DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE dept index dept_id dept_id 4 NULL 6 100.00 Using index; LooseScan
+1 SIMPLE emp ref dept_id dept_id 4 test.dept.dept_id 1 100.00 NULL
+1 SIMPLE dept ref dept_id dept_id 4 test.dept.dept_id 1 100.00 Using index
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+SET dept.dept_name = 'Junk'
+WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+SELECT * FROM dept;
+dept_id dept_name
+1 Junk
+2 Junk
+3 Junk
+4 Junk
+5 ref
+6 services
+ROLLBACK;
+UPDATE emp PARTITION(p0,p2), dept
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 not SET not SET 500 2
+3 not SET not SET 500 4
+4 not SET not SET 500 4
+5 not SET not SET 500 1
+6 not SET not SET 500 3
+7 not SET not SET 500 1
+8 not SET not SET 500 1
+9 not SET not SET 500 3
+10 not SET not SET 500 4
+11 not SET not SET 500 4
+12 not SET not SET 500 2
+13 not SET not SET 500 2
+14 not SET not SET 500 3
+15 not SET not SET 500 3
+16 not SET not SET 500 2
+17 not SET not SET 500 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 not SET not SET 500 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 not SET not SET 500 2
+ROLLBACK;
+UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+SET emp.store_id = 500
+WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 500 2
+2 Frank Williams 500 2
+3 Ellen Johnson 500 4
+4 Jim Smith 500 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 500 4
+11 Jill Stone 500 4
+12 Roger White 500 2
+13 Howard Andrews 500 2
+14 Fred Goldberg 500 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+SET emp.store_id = 500;
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+5 Mary Jones 500 1
+6 Linda Black 500 3
+7 Ed Jones 500 1
+8 June Wilson 500 1
+9 Andy Smith 500 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 500 3
+16 Alice Rogers 500 2
+17 Mark Morgan 500 3
+18 Karen Cole 500 2
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE dept.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+15 Barbara Brown 2 3
+16 Alice Rogers 2 2
+17 Mark Morgan 3 3
+18 Karen Cole 3 2
+ROLLBACK;
+DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+1 Bob Taylor 3 2
+2 Frank Williams 1 2
+3 Ellen Johnson 3 4
+4 Jim Smith 2 4
+ROLLBACK;
+DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+5 Mary Jones 1 1
+6 Linda Black 2 3
+7 Ed Jones 2 1
+8 June Wilson 3 1
+9 Andy Smith 1 3
+10 Lou Waters 2 4
+11 Jill Stone 1 4
+12 Roger White 3 2
+13 Howard Andrews 1 2
+14 Fred Goldberg 3 3
+ROLLBACK;
+DELETE IGNORE emp FROM emp JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM emp;
+id fname lname store_id dept_id
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ON emp.dept_id = dept.dept_id
+WHERE emp.dept_id IN (SELECT dept_id from dept);
+SELECT * FROM dept;
+dept_id dept_name
+1 admin
+2 finance
+3 IT
+4 security
+5 ref
+6 services
+ROLLBACK;
+DROP TABLE emp;
+DROP TABLE dept;
+COMMIT;
+# A test to verify multi-table UPDATE with BLOB data type
+CREATE TABLE tb1(c1 TEXT(16), c2 TEXT(16)) ENGINE=INNODB;
+CREATE TABLE tb2(c1 TEXT(16)) ENGINE=INNODB;
+INSERT INTO tb1 VALUES(repeat('a',1000),repeat('b',1000));
+Warnings:
+Warning 1265 Data truncated for column 'c1' at row 1
+Warning 1265 Data truncated for column 'c2' at row 1
+INSERT INTO tb2 VALUES(repeat('a',1000));
+Warnings:
+Warning 1265 Data truncated for column 'c1' at row 1
+COMMIT;
+EXPLAIN EXTENDED UPDATE tb1 JOIN tb2 ON tb1.c1=tb2.c1
+SET tb1.c2='geography'
+WHERE tb1.c1 IN (SELECT c1 FROM tb2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tb1 ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE tb2 ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tb2 ALL NULL NULL NULL NULL 1 100.00 Using where; FirstMatch(tb2); Using join buffer (Block Nested Loop)
+EXPLAIN EXTENDED DELETE FROM tb1 USING tb1 JOIN tb2
+ON tb1.c1=tb2.c1
+WHERE tb1.c1 IN (SELECT c1 FROM tb2);
+id select_type table type possible_keys key key_len ref rows filtered Extra
+1 SIMPLE tb1 ALL NULL NULL NULL NULL 1 100.00 NULL
+1 SIMPLE tb2 ALL NULL NULL NULL NULL 1 100.00 Using where; Using join buffer (Block Nested Loop)
+1 SIMPLE tb2 ALL NULL NULL NULL NULL 1 100.00 Using where; FirstMatch(tb2); Using join buffer (Block Nested Loop)
+UPDATE tb1 JOIN tb2 ON tb1.c1=tb2.c1
+SET tb1.c2='geography'
+WHERE tb1.c1 IN (SELECT c1 FROM tb2);
+SELECT * FROM tb1;
+c1 c2
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa geography
+ROLLBACK;
+DELETE FROM tb1 USING tb1 JOIN tb2
+ON tb1.c1=tb2.c1
+WHERE tb1.c1 IN (SELECT c1 FROM tb2);
+SELECT * FROM tb1;
+c1 c2
+ROLLBACK;
+DROP TABLE tb1;
+DROP TABLE tb2;
+COMMIT;
+DROP TABLE ot1,ot2,ot3,it1,it2,it3;
+SET optimizer_switch=default;
+COMMIT;
=== added file 'mysql-test/t/multi_table_upd_del_sj.test'
--- a/mysql-test/t/multi_table_upd_del_sj.test 1970-01-01 00:00:00 +0000
+++ b/mysql-test/t/multi_table_upd_del_sj.test 2012-09-11 08:30:28 +0000
@@ -0,0 +1,1618 @@
+##### This test is intended to verify that the optimizer chooses one of the #####
+##### semijoin strategies while executing a multi table UPDATE or DELETE #####
+##### statement. The test cases added below verifies that the optimizer uses#####
+##### semi-join strategy for certain statements which have supported JOIN #####
+##### syntax. #####
+##### Test case name : multi_table_upd_del_sj.test #####
+CREATE TABLE class(class_num INT NOT NULL PRIMARY KEY, class_name VARCHAR(20)) ENGINE=INNODB;
+CREATE TABLE student(stu_name VARCHAR(20) NOT NULL PRIMARY KEY, stu_city VARCHAR(20), stu_id INT) ENGINE=INNODB;
+CREATE TABLE roster(ros_num INT NOT NULL PRIMARY KEY, class_num INT, stu_name VARCHAR(20), FOREIGN KEY fk1(class_num) REFERENCES class(class_num), FOREIGN KEY fk2(stu_name) REFERENCES student(stu_name)) ENGINE=INNODB;
+INSERT INTO class VALUES(1,'math'),(2,'science'),(3,'history'),(4,'geog');
+INSERT INTO student VALUES('amit','bangalore',1),('ashu','hyderabad',2),('sumit','kota',2),('rajdeep','bbsr',4);
+INSERT INTO roster VALUES(1,3,'amit'),(2,4,'amit'),(3, 1, 'ashu'),(4,3,'ashu'),(5,1,'sumit'),(6,4,'sumit');
+
+CREATE TABLE ot1(a INT) ENGINE=INNODB;
+CREATE TABLE ot2(a INT) ENGINE=INNODB;
+CREATE TABLE ot3(a INT) ENGINE=INNODB;
+CREATE TABLE it1(a INT) ENGINE=INNODB;
+CREATE TABLE it2(a INT) ENGINE=INNODB;
+CREATE TABLE it3(a INT) ENGINE=INNODB;
+
+INSERT INTO ot1 VALUES(0),(1),(2),(3),(4),(5),(6),(7);
+INSERT INTO ot2 VALUES(0),(2),(4),(6);
+INSERT INTO ot3 VALUES(0),(3),(6);
+INSERT INTO it1 VALUES(0),(1),(2),(3),(4),(5),(6),(7);
+INSERT INTO it2 VALUES(0),(2),(4),(6);
+INSERT INTO it3 VALUES(0),(3),(6);
+COMMIT;
+
+# The following are multi-table UPDATE queries
+
+let $query1 = UPDATE class JOIN roster ON class.class_num=roster.class_num
+ SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+
+let $query2 = UPDATE class JOIN roster ON class.class_num=roster.class_num
+ SET class.class_name='geography'
+ WHERE roster.class_num IN (SELECT class_num FROM roster);
+
+let $query3 = UPDATE student JOIN roster ON student.stu_name=roster.stu_name
+ SET student.stu_city='kolkata'
+ WHERE student.stu_name IN (SELECT stu_name FROM roster);
+
+let $query4 = UPDATE student JOIN roster ON student.stu_name=roster.stu_name
+ SET student.stu_city='kolkata'
+ WHERE roster.stu_name IN (SELECT stu_name FROM roster);
+
+let $query5 = UPDATE LOW_PRIORITY class JOIN roster ON class.class_num=roster.class_num
+ SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+
+let $query6 = UPDATE IGNORE class JOIN roster ON class.class_num=roster.class_num
+ SET class.class_name='geography'
+ WHERE roster.class_num IN (SELECT class_num FROM roster);
+
+let $query7 = UPDATE class RIGHT JOIN roster ON class.class_num=roster.class_num
+ SET class.class_name='geography'
+ WHERE roster.class_num IN (SELECT class_num FROM roster);
+
+let $query8 = UPDATE student LEFT JOIN roster ON student.stu_name=roster.stu_name
+ SET student.stu_city='kolkata'
+ WHERE student.stu_name IN (SELECT stu_name FROM roster);
+
+let $query9 = UPDATE class INNER JOIN roster ON class.class_num=roster.class_num
+ SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+
+let $query10 = UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+ SET ot1.a = 111, ot2.a = 222
+ WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+
+let $query11 = UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+ SET ot1.a = 111
+ WHERE COALESCE(ot2.a,0) IN (SELECT a FROM it3);
+
+let $query12 = UPDATE ot1 LEFT JOIN ot2 ON ot1.a=ot2.a
+ SET ot1.a = 111, ot2.a = 222
+ WHERE (ot1.a,ot2.a) IN (SELECT a,a FROM it3 ORDER BY 2);
+
+let $query13 = UPDATE ot1 JOIN ot2 ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it3)
+ SET ot1.a = 111, ot2.a = 222
+ WHERE ot1.a IN (SELECT a FROM it3);
+
+let $query14 = UPDATE ot1 JOIN ot2 ON ot1.a IN (SELECT a FROM it3)
+ SET ot1.a = 111, ot2.a = 222
+ WHERE ot1.a IN (SELECT a FROM it3);
+
+let $query15 = UPDATE ot1 LEFT JOIN (ot2 JOIN ot3 ON ot2.a=ot3.a) ON ot1.a=ot2.a AND ot1.a IN (SELECT a FROM it1 ORDER BY a)
+ SET ot1.a = 111
+ WHERE ot1.a IN (SELECT a FROM it3 ORDER BY a);
+
+let $query1a = UPDATE class, roster
+ SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster ORDER BY ros_num);
+
+let $query1b = UPDATE class INNER JOIN roster ON class.class_num = roster.class_num
+ AND class.class_name = 'history' OR class.class_name = 'math'
+ SET class.class_name='geography'
+ WHERE class.class_num IN (SELECT class_num FROM roster ORDER BY ros_num);
+
+let $query1c = UPDATE class JOIN roster ON class.class_num IN (SELECT class_num from roster ORDER BY ros_num)
+ SET class.class_name='geography';
+
+# The following are multi-table DELETE queries
+
+let $queryd_1 = DELETE class FROM class RIGHT JOIN roster
+ ON class.class_num=roster.class_num
+ WHERE roster.class_num IN (SELECT class_num FROM roster);
+
+let $queryd_2 = DELETE LOW_PRIORITY FROM class USING class INNER JOIN roster
+ ON class.class_num=roster.class_num
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+
+let $queryd_3 = DELETE QUICK FROM class USING class LEFT JOIN roster
+ ON class.class_num=roster.class_num
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+
+let $queryd_4 = DELETE IGNORE FROM class USING class RIGHT JOIN roster
+ ON class.class_num=roster.class_num
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+
+let $queryd_5 = DELETE class FROM class, roster
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+
+let $queryd_6 = DELETE FROM class USING class, roster
+ WHERE class.class_num IN (SELECT class_num FROM roster);
+
+let $queryd_7 = DELETE student FROM student LEFT JOIN roster
+ ON student.stu_name=roster.stu_name
+ WHERE student.stu_name IN (SELECT stu_name FROM roster);
+
+let $queryd_8 = DELETE student FROM student INNER JOIN roster INNER JOIN class
+ ON student.stu_name=roster.stu_name AND roster.class_num = class.class_num AND stu_city = 'bbsr'
+ WHERE student.stu_name IN (SELECT stu_name FROM roster);
+
+let $queryd_9 = DELETE tz FROM tz JOIN ty
+ ON tz.c3=ty.c3 JOIN tx ON ty.c1=tx.c1
+ WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+
+let $queryd_10 = DELETE FROM tz USING tz JOIN ty
+ ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+ WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx WHERE c2>2));
+
+let $queryd_11 = DELETE FROM tz USING tz JOIN ty
+ ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+ WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+
+let $queryd_12 = DELETE FROM tz USING tz INNER JOIN ty
+ ON tz.c3=ty.c3 LEFT JOIN tx ON ty.c1=tx.c1
+ WHERE ty.c1 IN(SELECT c2 from ty WHERE ty.c1 IN(SELECT c1 from tx));
+
+let $queryd_13 = DELETE tz FROM tx,ty,tz
+ WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tx WHERE c2>2));
+
+let $queryd_14 = DELETE tz FROM tx,ty,tz
+ WHERE ty.c1 IN(SELECT c2 from tx WHERE ty.c1 IN(SELECT c1 from tx));
+
+# The following are a few SELECT queries
+
+let $query_s1 = SELECT * FROM class;
+
+let $query_s2 = SELECT * FROM student;
+
+let $query_s3 = SELECT * FROM ot1;
+
+let $query_s4 = SELECT * FROM ot2;
+
+let $query_s5 = SELECT * FROM tz;
+
+--echo # The optimizer_switch is set to default. We are verifying the various supported JOIN types for SEMI-JOIN
+
+SET optimizer_switch=default;
+COMMIT;
+SET autocommit=off;
+
+eval EXPLAIN EXTENDED $query1;
+eval EXPLAIN EXTENDED $query2;
+eval EXPLAIN EXTENDED $query3;
+eval EXPLAIN EXTENDED $query4;
+eval EXPLAIN EXTENDED $query5;
+eval EXPLAIN EXTENDED $query6;
+eval EXPLAIN EXTENDED $query7;
+eval EXPLAIN EXTENDED $query8;
+eval EXPLAIN EXTENDED $query9;
+eval EXPLAIN EXTENDED $query10;
+eval EXPLAIN EXTENDED $query11;
+eval EXPLAIN EXTENDED $query12;
+eval EXPLAIN EXTENDED $query13;
+eval EXPLAIN EXTENDED $query14;
+eval EXPLAIN EXTENDED $query15;
+
+eval $query1;
+eval $query_s1;
+ROLLBACK;
+eval $query2;
+eval $query_s1;
+ROLLBACK;
+eval $query3;
+eval $query_s2;
+ROLLBACK;
+eval $query4;
+eval $query_s2;
+ROLLBACK;
+eval $query5;
+eval $query_s1;
+ROLLBACK;
+eval $query6;
+eval $query_s1;
+ROLLBACK;
+eval $query7;
+eval $query_s1;
+ROLLBACK;
+eval $query8;
+eval $query_s2;
+ROLLBACK;
+eval $query9;
+eval $query_s1;
+ROLLBACK;
+eval $query10;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query11;
+eval $query_s3;
+ROLLBACK;
+eval $query12;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query13;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query14;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query15;
+eval $query_s3;
+ROLLBACK;
+
+--echo # The following queries would select Firstmatch based on the optimizer switch settings
+--echo # Please note that some of the queries would still show Duplicate Weedout
+
+SET optimizer_switch='semijoin=on,firstmatch=on,materialization=off,loosescan=off,index_condition_pushdown=off,mrr=off';
+COMMIT;
+
+eval EXPLAIN EXTENDED $query1;
+eval EXPLAIN EXTENDED $query7;
+eval EXPLAIN EXTENDED $query8;
+eval EXPLAIN EXTENDED $query9;
+eval EXPLAIN EXTENDED $query10;
+eval EXPLAIN EXTENDED $query11;
+eval EXPLAIN EXTENDED $query12;
+eval EXPLAIN EXTENDED $query13;
+eval EXPLAIN EXTENDED $query14;
+eval EXPLAIN EXTENDED $query15;
+
+eval $query1;
+eval $query_s1;
+ROLLBACK;
+eval $query7;
+eval $query_s1;
+ROLLBACK;
+eval $query8;
+eval $query_s2;
+ROLLBACK;
+eval $query9;
+eval $query_s1;
+ROLLBACK;
+eval $query10;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query11;
+eval $query_s3;
+ROLLBACK;
+eval $query12;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query13;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query14;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query15;
+eval $query_s3;
+ROLLBACK;
+
+--echo # The following queries would select Materialize based on the optimizer switch settings
+--echo # Please note that some of the queries would still show Duplicate Weedout
+
+SET optimizer_switch='semijoin=on,loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,materialization=on';
+COMMIT;
+
+eval EXPLAIN EXTENDED $query1;
+eval EXPLAIN EXTENDED $query7;
+eval EXPLAIN EXTENDED $query8;
+eval EXPLAIN EXTENDED $query9;
+eval EXPLAIN EXTENDED $query10;
+eval EXPLAIN EXTENDED $query11;
+eval EXPLAIN EXTENDED $query12;
+eval EXPLAIN EXTENDED $query13;
+eval EXPLAIN EXTENDED $query14;
+eval EXPLAIN EXTENDED $query15;
+
+eval $query1;
+eval $query_s1;
+ROLLBACK;
+eval $query7;
+eval $query_s1;
+ROLLBACK;
+eval $query8;
+eval $query_s2;
+ROLLBACK;
+eval $query9;
+eval $query_s1;
+ROLLBACK;
+eval $query10;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query11;
+eval $query_s3;
+ROLLBACK;
+eval $query12;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query13;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query14;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query15;
+eval $query_s3;
+ROLLBACK;
+
+--echo # The following queries would select Duplicate Weedout strategy based on the optimizer switch settings
+
+SET optimizer_switch='loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+
+eval EXPLAIN EXTENDED $query1;
+eval EXPLAIN EXTENDED $query7;
+eval EXPLAIN EXTENDED $query8;
+eval EXPLAIN EXTENDED $query9;
+eval EXPLAIN EXTENDED $query10;
+eval EXPLAIN EXTENDED $query11;
+eval EXPLAIN EXTENDED $query12;
+eval EXPLAIN EXTENDED $query13;
+eval EXPLAIN EXTENDED $query14;
+eval EXPLAIN EXTENDED $query15;
+
+eval $query1;
+eval $query_s1;
+ROLLBACK;
+eval $query7;
+eval $query_s1;
+ROLLBACK;
+eval $query8;
+eval $query_s2;
+ROLLBACK;
+eval $query9;
+eval $query_s1;
+ROLLBACK;
+eval $query10;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query11;
+eval $query_s3;
+ROLLBACK;
+eval $query12;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query13;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query14;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query15;
+eval $query_s3;
+ROLLBACK;
+
+--echo # The following queries would select Loosescan strategy based on the optimizer switch settings
+--echo # Please note that some of the queries would still show Duplicate Weedout
+
+SET optimizer_switch='loosescan=on,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+
+eval EXPLAIN EXTENDED $query1;
+eval EXPLAIN EXTENDED $query7;
+eval EXPLAIN EXTENDED $query8;
+eval EXPLAIN EXTENDED $query9;
+eval EXPLAIN EXTENDED $query10;
+eval EXPLAIN EXTENDED $query11;
+eval EXPLAIN EXTENDED $query12;
+eval EXPLAIN EXTENDED $query13;
+eval EXPLAIN EXTENDED $query14;
+eval EXPLAIN EXTENDED $query15;
+
+eval $query1;
+eval $query_s1;
+ROLLBACK;
+eval $query7;
+eval $query_s1;
+ROLLBACK;
+eval $query8;
+eval $query_s2;
+ROLLBACK;
+eval $query9;
+eval $query_s1;
+ROLLBACK;
+eval $query10;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query11;
+eval $query_s3;
+ROLLBACK;
+eval $query12;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query13;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query14;
+eval $query_s3;
+eval $query_s4;
+ROLLBACK;
+eval $query15;
+eval $query_s3;
+ROLLBACK;
+
+--echo # The following queries would give various strategies based on the default optimizer switch settings
+
+SET optimizer_switch=default;
+COMMIT;
+
+eval EXPLAIN EXTENDED $query1a;
+eval EXPLAIN EXTENDED $query1b;
+
+eval $query1a;
+eval $query_s1;
+ROLLBACK;
+eval $query1b;
+eval $query_s1;
+ROLLBACK;
+
+--echo # Using IN subquery predicate in the ON clause of the JOIN
+
+eval EXPLAIN EXTENDED $query1c;
+
+eval $query1c;
+eval $query_s1;
+ROLLBACK;
+
+--echo # The following set of tables are created to verify JOINS between 3 tables
+
+CREATE TABLE tx(c1 INT NOT NULL PRIMARY KEY, c2 INT) ENGINE=INNODB;
+CREATE TABLE ty(c1 INT, c2 INT, c3 VARCHAR(20) NOT NULL PRIMARY KEY, FOREIGN KEY fk1(c1) REFERENCES tx(c1)) ENGINE=INNODB;
+CREATE TABLE tz(c1 INT, c2 INT, c3 VARCHAR(20), FOREIGN KEY fk2(c3) REFERENCES ty(c3)) ENGINE=INNODB;
+
+INSERT INTO tx VALUES(1,1),(2,2),(3,3),(4,4),(5,5);
+INSERT INTO ty VALUES(1,1,'1 match tx'),(2,2,'2 match tx'),(4,4,'4 match tx');
+INSERT INTO tz VALUES(2,2,'2 match tx'),(4,4,'4 match tx');
+INSERT INTO tz VALUES(20,20,'2 match tx'),(40,40,'4 match tx');
+INSERT INTO tz VALUES(200,200,'2 match tx'),(400,400,'4 match tx');
+COMMIT;
+
+--echo # Verifying various variations of the JOIN syntax using 3 tables
+
+let $query2a = UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2) ORDER BY c1);
+
+let $query2b = UPDATE tx JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2));
+
+let $query2c = UPDATE tx JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT c1 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2) ORDER BY c2);
+
+let $query2d = UPDATE tx JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz));
+
+let $query2e = UPDATE tx INNER JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz ORDER BY c2));
+
+let $query2f = UPDATE tx,ty,tz
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz WHERE c2>2 ORDER BY c2));
+
+let $query2g = UPDATE tx,ty,tz
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT c2 from ty WHERE ty.c3 IN(SELECT c3 from tz));
+
+let $query2_s = SELECT * FROM tx;
+
+eval EXPLAIN EXTENDED $query2a;
+eval EXPLAIN EXTENDED $query2b;
+eval EXPLAIN EXTENDED $query2c;
+eval EXPLAIN EXTENDED $query2d;
+eval EXPLAIN EXTENDED $query2e;
+eval EXPLAIN EXTENDED $query2f;
+eval EXPLAIN EXTENDED $query2g;
+
+eval $query2a;
+eval $query2_s;
+ROLLBACK;
+eval $query2b;
+eval $query2_s;
+ROLLBACK;
+eval $query2c;
+eval $query2_s;
+ROLLBACK;
+eval $query2d;
+eval $query2_s;
+ROLLBACK;
+eval $query2e;
+eval $query2_s;
+ROLLBACK;
+eval $query2f;
+eval $query2_s;
+ROLLBACK;
+eval $query2g;
+eval $query2_s;
+ROLLBACK;
+
+--echo # The following queries have JOIN syntax within the IN sub-query
+
+let $query3a = UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT ty.c2 from ty,tz WHERE ty.c3 = tz.c3 and tz.c2 > 2);
+
+let $query3b = UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT ty.c2 from ty JOIN tz ON ty.c3 = tz.c3 and tz.c2 > 2);
+
+let $query3c = UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT ty.c2 from ty INNER JOIN tz ON ty.c3 = tz.c3 and tz.c2 > 2);
+
+let $query3d = UPDATE tx JOIN ty ON tx.c1=ty.c1 JOIN tz ON ty.c3=tz.c3
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT ty.c2 from ty LEFT JOIN tz ON ty.c3 = tz.c3 and tz.c2 > 2);
+
+let $query3e = UPDATE tx INNER JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+ SET tx.c2=100
+ WHERE tx.c1 IN(SELECT c2 from ty) AND tx.c1 IN(SELECT c2 from tz);
+
+eval EXPLAIN EXTENDED $query3a;
+eval EXPLAIN EXTENDED $query3b;
+eval EXPLAIN EXTENDED $query3c;
+eval EXPLAIN EXTENDED $query3d;
+eval EXPLAIN EXTENDED $query3e;
+
+eval $query3a;
+eval $query2_s;
+ROLLBACK;
+eval $query3b;
+eval $query2_s;
+ROLLBACK;
+eval $query3c;
+eval $query2_s;
+ROLLBACK;
+eval $query3d;
+eval $query2_s;
+ROLLBACK;
+eval $query3e;
+eval $query2_s;
+ROLLBACK;
+
+--echo # Updating columns from more than 1 table
+
+let $query4a = UPDATE tx,ty,tz
+ SET tx.c2=100,tz.c2=101
+ WHERE tx.c1 IN(SELECT c2 from ty);
+
+let $query4b = UPDATE tx INNER JOIN ty ON tx.c1=ty.c1 LEFT JOIN tz ON ty.c3=tz.c3
+ SET tx.c2=100,tz.c2=101
+ WHERE tx.c1 IN(SELECT c2 from ty);
+
+let $query4_s1 = SELECT * FROM tx;
+
+let $query4_s2 = SELECT * FROM tz;
+
+eval EXPLAIN EXTENDED $query4a;
+eval EXPLAIN EXTENDED $query4b;
+
+eval $query4a;
+eval $query4_s1;
+eval $query4_s2;
+ROLLBACK;
+eval $query4b;
+eval $query4_s1;
+eval $query4_s2;
+ROLLBACK;
+
+# Verifying the multi-table DELETE in the tests below
+--echo # Testing multi-table DELETE
+
+ALTER TABLE roster DROP FOREIGN KEY roster_ibfk_1;
+ALTER TABLE roster DROP FOREIGN KEY roster_ibfk_2;
+ALTER TABLE roster DROP PRIMARY KEY;
+ALTER TABLE class DROP PRIMARY KEY;
+ALTER TABLE student DROP PRIMARY KEY;
+ALTER TABLE roster ADD KEY(class_num);
+
+--echo # The optimizer_switch is set to default. We are verifying the various supported JOIN types for SEMI-JOIN
+
+SET optimizer_switch=default;
+COMMIT;
+
+eval EXPLAIN EXTENDED $queryd_1;
+eval EXPLAIN EXTENDED $queryd_2;
+eval EXPLAIN EXTENDED $queryd_3;
+eval EXPLAIN EXTENDED $queryd_4;
+eval EXPLAIN EXTENDED $queryd_5;
+eval EXPLAIN EXTENDED $queryd_6;
+eval EXPLAIN EXTENDED $queryd_7;
+eval EXPLAIN EXTENDED $queryd_8;
+eval EXPLAIN EXTENDED $queryd_9;
+eval EXPLAIN EXTENDED $queryd_10;
+eval EXPLAIN EXTENDED $queryd_11;
+eval EXPLAIN EXTENDED $queryd_12;
+eval EXPLAIN EXTENDED $queryd_13;
+eval EXPLAIN EXTENDED $queryd_14;
+
+eval $queryd_1;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_2;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_3;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_4;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_5;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_6;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_7;
+eval $query_s2;
+ROLLBACK;
+eval $queryd_8;
+eval $query_s2;
+ROLLBACK;
+eval $queryd_9;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_10;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_11;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_12;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_13;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_14;
+eval $query_s5;
+ROLLBACK;
+
+--echo # The following queries would select Firstmatch based on the optimizer switch settings
+--echo # Please note that some of the queries would still show Duplicate Weedout
+
+SET optimizer_switch='semijoin=on,firstmatch=on,materialization=off,loosescan=off,index_condition_pushdown=off,mrr=off';
+COMMIT;
+
+eval EXPLAIN EXTENDED $queryd_1;
+eval EXPLAIN EXTENDED $queryd_2;
+eval EXPLAIN EXTENDED $queryd_3;
+eval EXPLAIN EXTENDED $queryd_4;
+eval EXPLAIN EXTENDED $queryd_5;
+eval EXPLAIN EXTENDED $queryd_6;
+eval EXPLAIN EXTENDED $queryd_7;
+eval EXPLAIN EXTENDED $queryd_8;
+eval EXPLAIN EXTENDED $queryd_9;
+eval EXPLAIN EXTENDED $queryd_10;
+eval EXPLAIN EXTENDED $queryd_11;
+eval EXPLAIN EXTENDED $queryd_12;
+eval EXPLAIN EXTENDED $queryd_13;
+eval EXPLAIN EXTENDED $queryd_14;
+
+eval $queryd_1;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_2;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_3;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_4;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_5;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_6;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_7;
+eval $query_s2;
+ROLLBACK;
+eval $queryd_8;
+eval $query_s2;
+ROLLBACK;
+eval $queryd_9;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_10;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_11;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_12;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_13;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_14;
+eval $query_s5;
+ROLLBACK;
+
+--echo # The following queries would select Materialize based on the optimizer switch settings
+--echo # Please note that some of the queries would still show Duplicate Weedout
+
+SET optimizer_switch='semijoin=on,loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,materialization=on';
+COMMIT;
+
+eval EXPLAIN EXTENDED $queryd_1;
+eval EXPLAIN EXTENDED $queryd_2;
+eval EXPLAIN EXTENDED $queryd_3;
+eval EXPLAIN EXTENDED $queryd_4;
+eval EXPLAIN EXTENDED $queryd_5;
+eval EXPLAIN EXTENDED $queryd_6;
+eval EXPLAIN EXTENDED $queryd_7;
+eval EXPLAIN EXTENDED $queryd_8;
+eval EXPLAIN EXTENDED $queryd_9;
+eval EXPLAIN EXTENDED $queryd_10;
+eval EXPLAIN EXTENDED $queryd_11;
+eval EXPLAIN EXTENDED $queryd_12;
+eval EXPLAIN EXTENDED $queryd_13;
+eval EXPLAIN EXTENDED $queryd_14;
+
+eval $queryd_1;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_2;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_3;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_4;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_5;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_6;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_7;
+eval $query_s2;
+ROLLBACK;
+eval $queryd_8;
+eval $query_s2;
+ROLLBACK;
+eval $queryd_9;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_10;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_11;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_12;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_13;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_14;
+eval $query_s5;
+ROLLBACK;
+
+--echo # The following queries would select Duplicate Weedout strategy based on the optimizer switch settings
+
+SET optimizer_switch='loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+
+eval EXPLAIN EXTENDED $queryd_1;
+eval EXPLAIN EXTENDED $queryd_2;
+eval EXPLAIN EXTENDED $queryd_3;
+eval EXPLAIN EXTENDED $queryd_4;
+eval EXPLAIN EXTENDED $queryd_5;
+eval EXPLAIN EXTENDED $queryd_6;
+eval EXPLAIN EXTENDED $queryd_7;
+eval EXPLAIN EXTENDED $queryd_8;
+eval EXPLAIN EXTENDED $queryd_9;
+eval EXPLAIN EXTENDED $queryd_10;
+eval EXPLAIN EXTENDED $queryd_11;
+eval EXPLAIN EXTENDED $queryd_12;
+eval EXPLAIN EXTENDED $queryd_13;
+eval EXPLAIN EXTENDED $queryd_14;
+
+eval $queryd_1;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_2;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_3;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_4;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_5;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_6;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_7;
+eval $query_s2;
+ROLLBACK;
+eval $queryd_8;
+eval $query_s2;
+ROLLBACK;
+eval $queryd_9;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_10;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_11;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_12;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_13;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_14;
+eval $query_s5;
+ROLLBACK;
+
+--echo # The following queries would select Loosescan strategy based on the optimizer switch settings
+--echo # Please note that some of the queries would still show Duplicate Weedout
+
+SET optimizer_switch='loosescan=on,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+
+eval EXPLAIN EXTENDED $queryd_1;
+eval EXPLAIN EXTENDED $queryd_2;
+eval EXPLAIN EXTENDED $queryd_3;
+eval EXPLAIN EXTENDED $queryd_4;
+eval EXPLAIN EXTENDED $queryd_5;
+eval EXPLAIN EXTENDED $queryd_6;
+eval EXPLAIN EXTENDED $queryd_7;
+eval EXPLAIN EXTENDED $queryd_8;
+eval EXPLAIN EXTENDED $queryd_9;
+eval EXPLAIN EXTENDED $queryd_10;
+eval EXPLAIN EXTENDED $queryd_11;
+eval EXPLAIN EXTENDED $queryd_12;
+eval EXPLAIN EXTENDED $queryd_13;
+eval EXPLAIN EXTENDED $queryd_14;
+
+eval $queryd_1;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_2;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_3;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_4;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_5;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_6;
+eval $query_s1;
+ROLLBACK;
+eval $queryd_7;
+eval $query_s2;
+ROLLBACK;
+eval $queryd_8;
+eval $query_s2;
+ROLLBACK;
+eval $queryd_9;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_10;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_11;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_12;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_13;
+eval $query_s5;
+ROLLBACK;
+eval $queryd_14;
+eval $query_s5;
+ROLLBACK;
+
+-- echo # Drop the tables that were created
+
+DROP TABLE tz;
+DROP TABLE ty;
+DROP TABLE tx;
+DROP TABLE roster;
+DROP TABLE student;
+DROP TABLE class;
+COMMIT;
+
+###################################### The following set of queries are verified for UPDATE on partitioned tables ################################################
+
+--echo # Verifying the feature with partitioned table
+
+CREATE TABLE emp (
+ id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
+ fname VARCHAR(25) NOT NULL,
+ lname VARCHAR(25) NOT NULL,
+ store_id INT NOT NULL,
+ dept_id INT NOT NULL,
+ KEY(dept_id)
+) ENGINE=INNODB
+ PARTITION BY RANGE(id) (
+ PARTITION p0 VALUES LESS THAN (5),
+ PARTITION p1 VALUES LESS THAN (10),
+ PARTITION p2 VALUES LESS THAN (15),
+ PARTITION p3 VALUES LESS THAN MAXVALUE
+);
+
+CREATE TABLE dept (
+ dept_id INT NOT NULL,
+ dept_name varchar(25) NOT NULL,
+ KEY(dept_id)
+) ENGINE=INNODB
+ PARTITION BY RANGE(dept_id) (
+ PARTITION p0 VALUES LESS THAN (3),
+ PARTITION p1 VALUES LESS THAN (6),
+ PARTITION p3 VALUES LESS THAN MAXVALUE
+);
+
+INSERT INTO emp(fname, lname, store_id, dept_id) VALUES
+ ('Bob', 'Taylor', 3, 2), ('Frank', 'Williams', 1, 2),
+ ('Ellen', 'Johnson', 3, 4), ('Jim', 'Smith', 2, 4),
+ ('Mary', 'Jones', 1, 1), ('Linda', 'Black', 2, 3),
+ ('Ed', 'Jones', 2, 1), ('June', 'Wilson', 3, 1),
+ ('Andy', 'Smith', 1, 3), ('Lou', 'Waters', 2, 4),
+ ('Jill', 'Stone', 1, 4), ('Roger', 'White', 3, 2),
+ ('Howard', 'Andrews', 1, 2), ('Fred', 'Goldberg', 3, 3),
+ ('Barbara', 'Brown', 2, 3), ('Alice', 'Rogers', 2, 2),
+ ('Mark', 'Morgan', 3, 3), ('Karen', 'Cole', 3, 2);
+
+INSERT INTO dept VALUES
+ (1,'admin'),(2, 'finance'),
+ (3,'IT'),(4, 'security'),
+ (5,'ref'),(6,'services');
+COMMIT;
+
+--echo # Verfying with partitioned tables keeping the default optimizer_switch settings
+
+let $query5a = UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id = dept.dept_id
+ SET emp.store_id = 500
+ WHERE emp.dept_id IN (SELECT dept_id from dept);
+
+let $query5b = UPDATE emp PARTITION(p1,p0) JOIN dept ON emp.dept_id = dept.dept_id
+ SET emp.store_id = 500
+ WHERE dept.dept_id IN (SELECT dept_id from dept);
+
+let $query5c = UPDATE emp PARTITION(p0,p3) RIGHT JOIN dept ON emp.dept_id = dept.dept_id
+ SET emp.store_id = 500
+ WHERE emp.dept_id IN (SELECT dept_id from dept);
+
+let $query5d = UPDATE LOW_PRIORITY emp PARTITION(p3,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+ SET emp.store_id = 500
+ WHERE emp.dept_id IN (SELECT dept_id from dept);
+
+let $query5e = UPDATE IGNORE emp PARTITION(p3,p1,p2,p0) JOIN dept ON emp.dept_id = dept.dept_id
+ SET emp.store_id = 500
+ WHERE emp.dept_id IN (SELECT dept_id from dept);
+
+let $query5f = UPDATE emp LEFT JOIN dept PARTITION(p0) ON emp.dept_id = dept.dept_id
+ SET dept.dept_name = 'Junk'
+ WHERE dept.dept_id IN (SELECT dept_id from emp);
+
+let $query5g = UPDATE emp INNER JOIN dept PARTITION(p1,p0) ON emp.dept_id = dept.dept_id
+ SET dept.dept_name = 'Junk'
+ WHERE dept.dept_id IN (SELECT DISTINCT dept_id from emp);
+
+let $query5h = UPDATE emp PARTITION(p0,p2), dept
+ SET emp.store_id = 500
+ WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+
+let $query5i = UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id
+ SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+ WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+
+let $query5j = UPDATE emp INNER JOIN dept ON emp.dept_id = dept.dept_id AND emp.fname = 'Bob' OR emp.lname = 'Cole'
+ SET emp.store_id = 500, emp.lname = 'not SET', emp.fname = 'not SET'
+ WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+
+let $query5k = UPDATE emp PARTITION(p0,p1,p2) INNER JOIN dept ON emp.dept_id = dept.dept_id
+ SET emp.store_id = 500
+ WHERE emp.dept_id IN (SELECT dept_id FROM dept);
+
+let $query5l = UPDATE emp PARTITION(p1,p3) JOIN dept ON emp.dept_id IN (SELECT dept_id FROM dept)
+ SET emp.store_id = 500;
+
+let $queryd_5a = DELETE emp FROM emp PARTITION(p1,p3) JOIN dept
+ ON emp.dept_id = dept.dept_id
+ WHERE emp.dept_id IN (SELECT dept_id from dept);
+
+let $queryd_5b = DELETE FROM emp USING emp PARTITION(p0) JOIN dept
+ ON emp.dept_id = dept.dept_id
+ WHERE dept.dept_id IN (SELECT dept_id from dept);
+
+let $queryd_5c = DELETE QUICK emp FROM emp PARTITION(p1,p2,p3) RIGHT JOIN dept
+ ON emp.dept_id = dept.dept_id
+ WHERE emp.dept_id IN (SELECT dept_id from dept);
+
+let $queryd_5d = DELETE LOW_PRIORITY emp FROM emp PARTITION(p3,p0) JOIN dept
+ ON emp.dept_id = dept.dept_id
+ WHERE emp.dept_id IN (SELECT dept_id from dept);
+
+let $queryd_5e = DELETE IGNORE emp FROM emp JOIN dept
+ ON emp.dept_id = dept.dept_id
+ WHERE emp.dept_id IN (SELECT dept_id from dept);
+
+let $queryd_5f = DELETE emp FROM emp PARTITION(p1,p3,p0) LEFT JOIN dept
+ ON emp.dept_id = dept.dept_id
+ WHERE emp.dept_id IN (SELECT dept_id from dept);
+
+let $queryd_5g = DELETE emp FROM emp PARTITION(p1,p3,p0,p2) INNER JOIN dept
+ ON emp.dept_id = dept.dept_id
+ WHERE emp.dept_id IN (SELECT dept_id from dept);
+
+let $query5_s1 = SELECT * FROM emp;
+
+let $query5_s2 = SELECT * FROM dept;
+
+eval EXPLAIN EXTENDED $query5a;
+eval EXPLAIN EXTENDED $query5b;
+eval EXPLAIN EXTENDED $query5c;
+eval EXPLAIN EXTENDED $query5d;
+eval EXPLAIN EXTENDED $query5e;
+eval EXPLAIN EXTENDED $query5f;
+eval EXPLAIN EXTENDED $query5g;
+eval EXPLAIN EXTENDED $query5h;
+eval EXPLAIN EXTENDED $query5i;
+eval EXPLAIN EXTENDED $query5j;
+eval EXPLAIN EXTENDED $query5k;
+eval EXPLAIN EXTENDED $query5l;
+eval EXPLAIN EXTENDED $queryd_5a;
+eval EXPLAIN EXTENDED $queryd_5b;
+eval EXPLAIN EXTENDED $queryd_5c;
+eval EXPLAIN EXTENDED $queryd_5d;
+eval EXPLAIN EXTENDED $queryd_5e;
+eval EXPLAIN EXTENDED $queryd_5f;
+eval EXPLAIN EXTENDED $queryd_5g;
+
+eval $query5a;
+eval $query5_s1;
+ROLLBACK;
+eval $query5b;
+eval $query5_s1;
+ROLLBACK;
+eval $query5c;
+eval $query5_s1;
+ROLLBACK;
+eval $query5d;
+eval $query5_s1;
+ROLLBACK;
+eval $query5e;
+eval $query5_s1;
+ROLLBACK;
+eval $query5f;
+eval $query5_s2;
+ROLLBACK;
+eval $query5g;
+eval $query5_s2;
+ROLLBACK;
+eval $query5h;
+eval $query5_s1;
+ROLLBACK;
+eval $query5i;
+eval $query5_s1;
+ROLLBACK;
+eval $query5j;
+eval $query5_s1;
+ROLLBACK;
+eval $query5k;
+eval $query5_s1;
+ROLLBACK;
+eval $query5l;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5a;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5b;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5c;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5d;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5e;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5f;
+eval $query5_s2;
+ROLLBACK;
+eval $queryd_5g;
+eval $query5_s2;
+ROLLBACK;
+
+--echo # Tables are partitioned, queries uses Firstmatch
+--echo # Please note that some of the queries would still show Duplicate Weedout
+
+SET optimizer_switch='semijoin=on,firstmatch=on,materialization=off,loosescan=off,index_condition_pushdown=off,mrr=off';
+COMMIT;
+
+eval EXPLAIN EXTENDED $query5a;
+eval EXPLAIN EXTENDED $query5b;
+eval EXPLAIN EXTENDED $query5c;
+eval EXPLAIN EXTENDED $query5d;
+eval EXPLAIN EXTENDED $query5e;
+eval EXPLAIN EXTENDED $query5f;
+eval EXPLAIN EXTENDED $query5g;
+eval EXPLAIN EXTENDED $query5h;
+eval EXPLAIN EXTENDED $query5i;
+eval EXPLAIN EXTENDED $query5j;
+eval EXPLAIN EXTENDED $query5k;
+eval EXPLAIN EXTENDED $query5l;
+eval EXPLAIN EXTENDED $queryd_5a;
+eval EXPLAIN EXTENDED $queryd_5b;
+eval EXPLAIN EXTENDED $queryd_5c;
+eval EXPLAIN EXTENDED $queryd_5d;
+eval EXPLAIN EXTENDED $queryd_5e;
+eval EXPLAIN EXTENDED $queryd_5f;
+eval EXPLAIN EXTENDED $queryd_5g;
+
+eval $query5a;
+eval $query5_s1;
+ROLLBACK;
+eval $query5b;
+eval $query5_s1;
+ROLLBACK;
+eval $query5c;
+eval $query5_s1;
+ROLLBACK;
+eval $query5d;
+eval $query5_s1;
+ROLLBACK;
+eval $query5e;
+eval $query5_s1;
+ROLLBACK;
+eval $query5f;
+eval $query5_s2;
+ROLLBACK;
+eval $query5g;
+eval $query5_s2;
+ROLLBACK;
+eval $query5h;
+eval $query5_s1;
+ROLLBACK;
+eval $query5i;
+eval $query5_s1;
+ROLLBACK;
+eval $query5j;
+eval $query5_s1;
+ROLLBACK;
+eval $query5k;
+eval $query5_s1;
+ROLLBACK;
+eval $query5l;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5a;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5b;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5c;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5d;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5e;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5f;
+eval $query5_s2;
+ROLLBACK;
+eval $queryd_5g;
+eval $query5_s2;
+ROLLBACK;
+
+--echo # Tables are partitioned, queries uses Materialization
+--echo # Please note that some of the queries would still show Duplicate Weedout
+
+SET optimizer_switch='loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=on';
+COMMIT;
+
+eval EXPLAIN EXTENDED $query5a;
+eval EXPLAIN EXTENDED $query5b;
+eval EXPLAIN EXTENDED $query5c;
+eval EXPLAIN EXTENDED $query5d;
+eval EXPLAIN EXTENDED $query5e;
+eval EXPLAIN EXTENDED $query5f;
+eval EXPLAIN EXTENDED $query5g;
+eval EXPLAIN EXTENDED $query5h;
+eval EXPLAIN EXTENDED $query5i;
+eval EXPLAIN EXTENDED $query5j;
+eval EXPLAIN EXTENDED $query5k;
+eval EXPLAIN EXTENDED $query5l;
+eval EXPLAIN EXTENDED $queryd_5a;
+eval EXPLAIN EXTENDED $queryd_5b;
+eval EXPLAIN EXTENDED $queryd_5c;
+eval EXPLAIN EXTENDED $queryd_5d;
+eval EXPLAIN EXTENDED $queryd_5e;
+eval EXPLAIN EXTENDED $queryd_5f;
+eval EXPLAIN EXTENDED $queryd_5g;
+
+eval $query5a;
+eval $query5_s1;
+ROLLBACK;
+eval $query5b;
+eval $query5_s1;
+ROLLBACK;
+eval $query5c;
+eval $query5_s1;
+ROLLBACK;
+eval $query5d;
+eval $query5_s1;
+ROLLBACK;
+eval $query5e;
+eval $query5_s1;
+ROLLBACK;
+eval $query5f;
+eval $query5_s2;
+ROLLBACK;
+eval $query5g;
+eval $query5_s2;
+ROLLBACK;
+eval $query5h;
+eval $query5_s1;
+ROLLBACK;
+eval $query5i;
+eval $query5_s1;
+ROLLBACK;
+eval $query5j;
+eval $query5_s1;
+ROLLBACK;
+eval $query5k;
+eval $query5_s1;
+ROLLBACK;
+eval $query5l;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5a;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5b;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5c;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5d;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5e;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5f;
+eval $query5_s2;
+ROLLBACK;
+eval $queryd_5g;
+eval $query5_s2;
+ROLLBACK;
+
+--echo # Tables are partitioned, queries uses Duplicate Weedout strategy
+
+SET optimizer_switch='loosescan=off,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+
+eval EXPLAIN EXTENDED $query5a;
+eval EXPLAIN EXTENDED $query5b;
+eval EXPLAIN EXTENDED $query5c;
+eval EXPLAIN EXTENDED $query5d;
+eval EXPLAIN EXTENDED $query5e;
+eval EXPLAIN EXTENDED $query5f;
+eval EXPLAIN EXTENDED $query5g;
+eval EXPLAIN EXTENDED $query5h;
+eval EXPLAIN EXTENDED $query5i;
+eval EXPLAIN EXTENDED $query5j;
+eval EXPLAIN EXTENDED $query5k;
+eval EXPLAIN EXTENDED $query5l;
+eval EXPLAIN EXTENDED $queryd_5a;
+eval EXPLAIN EXTENDED $queryd_5b;
+eval EXPLAIN EXTENDED $queryd_5c;
+eval EXPLAIN EXTENDED $queryd_5d;
+eval EXPLAIN EXTENDED $queryd_5e;
+eval EXPLAIN EXTENDED $queryd_5f;
+eval EXPLAIN EXTENDED $queryd_5g;
+
+eval $query5a;
+eval $query5_s1;
+ROLLBACK;
+eval $query5b;
+eval $query5_s1;
+ROLLBACK;
+eval $query5c;
+eval $query5_s1;
+ROLLBACK;
+eval $query5d;
+eval $query5_s1;
+ROLLBACK;
+eval $query5e;
+eval $query5_s1;
+ROLLBACK;
+eval $query5f;
+eval $query5_s2;
+ROLLBACK;
+eval $query5g;
+eval $query5_s2;
+ROLLBACK;
+eval $query5h;
+eval $query5_s1;
+ROLLBACK;
+eval $query5i;
+eval $query5_s1;
+ROLLBACK;
+eval $query5j;
+eval $query5_s1;
+ROLLBACK;
+eval $query5k;
+eval $query5_s1;
+ROLLBACK;
+eval $query5l;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5a;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5b;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5c;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5d;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5e;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5f;
+eval $query5_s2;
+ROLLBACK;
+eval $queryd_5g;
+eval $query5_s2;
+ROLLBACK;
+
+--echo # Tables are partitioned, queries uses Loosescan strategy
+--echo # Please note that some of the queries would still show Duplicate Weedout
+
+SET optimizer_switch='loosescan=on,firstmatch=off,index_condition_pushdown=off,mrr=off,semijoin=on,materialization=off';
+COMMIT;
+
+eval EXPLAIN EXTENDED $query5a;
+eval EXPLAIN EXTENDED $query5b;
+eval EXPLAIN EXTENDED $query5c;
+eval EXPLAIN EXTENDED $query5d;
+eval EXPLAIN EXTENDED $query5e;
+eval EXPLAIN EXTENDED $query5f;
+eval EXPLAIN EXTENDED $query5g;
+eval EXPLAIN EXTENDED $query5h;
+eval EXPLAIN EXTENDED $query5i;
+eval EXPLAIN EXTENDED $query5j;
+eval EXPLAIN EXTENDED $query5k;
+eval EXPLAIN EXTENDED $query5l;
+eval EXPLAIN EXTENDED $queryd_5a;
+eval EXPLAIN EXTENDED $queryd_5b;
+eval EXPLAIN EXTENDED $queryd_5c;
+eval EXPLAIN EXTENDED $queryd_5d;
+eval EXPLAIN EXTENDED $queryd_5e;
+eval EXPLAIN EXTENDED $queryd_5f;
+eval EXPLAIN EXTENDED $queryd_5g;
+
+eval $query5a;
+eval $query5_s1;
+ROLLBACK;
+eval $query5b;
+eval $query5_s1;
+ROLLBACK;
+eval $query5c;
+eval $query5_s1;
+ROLLBACK;
+eval $query5d;
+eval $query5_s1;
+ROLLBACK;
+eval $query5e;
+eval $query5_s1;
+ROLLBACK;
+eval $query5f;
+eval $query5_s2;
+ROLLBACK;
+eval $query5g;
+eval $query5_s2;
+ROLLBACK;
+eval $query5h;
+eval $query5_s1;
+ROLLBACK;
+eval $query5i;
+eval $query5_s1;
+ROLLBACK;
+eval $query5j;
+eval $query5_s1;
+ROLLBACK;
+eval $query5k;
+eval $query5_s1;
+ROLLBACK;
+eval $query5l;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5a;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5b;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5c;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5d;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5e;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5f;
+eval $query5_s2;
+ROLLBACK;
+eval $queryd_5g;
+eval $query5_s2;
+ROLLBACK;
+
+--echo # Tables are partitioned, queries with default optimizer_switch settings
+
+SET optimizer_switch=default;
+COMMIT;
+
+eval EXPLAIN EXTENDED $query5a;
+eval EXPLAIN EXTENDED $query5b;
+eval EXPLAIN EXTENDED $query5c;
+eval EXPLAIN EXTENDED $query5d;
+eval EXPLAIN EXTENDED $query5e;
+eval EXPLAIN EXTENDED $query5f;
+eval EXPLAIN EXTENDED $query5g;
+eval EXPLAIN EXTENDED $query5h;
+eval EXPLAIN EXTENDED $query5i;
+eval EXPLAIN EXTENDED $query5j;
+eval EXPLAIN EXTENDED $query5k;
+eval EXPLAIN EXTENDED $query5l;
+eval EXPLAIN EXTENDED $queryd_5a;
+eval EXPLAIN EXTENDED $queryd_5b;
+eval EXPLAIN EXTENDED $queryd_5c;
+eval EXPLAIN EXTENDED $queryd_5d;
+eval EXPLAIN EXTENDED $queryd_5e;
+eval EXPLAIN EXTENDED $queryd_5f;
+eval EXPLAIN EXTENDED $queryd_5g;
+
+eval $query5a;
+eval $query5_s1;
+ROLLBACK;
+eval $query5b;
+eval $query5_s1;
+ROLLBACK;
+eval $query5c;
+eval $query5_s1;
+ROLLBACK;
+eval $query5d;
+eval $query5_s1;
+ROLLBACK;
+eval $query5e;
+eval $query5_s1;
+ROLLBACK;
+eval $query5f;
+eval $query5_s2;
+ROLLBACK;
+eval $query5g;
+eval $query5_s2;
+ROLLBACK;
+eval $query5h;
+eval $query5_s1;
+ROLLBACK;
+eval $query5i;
+eval $query5_s1;
+ROLLBACK;
+eval $query5j;
+eval $query5_s1;
+ROLLBACK;
+eval $query5k;
+eval $query5_s1;
+ROLLBACK;
+eval $query5l;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5a;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5b;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5c;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5d;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5e;
+eval $query5_s1;
+ROLLBACK;
+eval $queryd_5f;
+eval $query5_s2;
+ROLLBACK;
+eval $queryd_5g;
+eval $query5_s2;
+ROLLBACK;
+
+DROP TABLE emp;
+DROP TABLE dept;
+COMMIT;
+
+################### Multi-table UPDATE on tables having BLOB data type ##################
+
+-- echo # A test to verify multi-table UPDATE with BLOB data type
+
+CREATE TABLE tb1(c1 TEXT(16), c2 TEXT(16)) ENGINE=INNODB;
+CREATE TABLE tb2(c1 TEXT(16)) ENGINE=INNODB;
+
+INSERT INTO tb1 VALUES(repeat('a',1000),repeat('b',1000));
+INSERT INTO tb2 VALUES(repeat('a',1000));
+COMMIT;
+
+let $query6a = UPDATE tb1 JOIN tb2 ON tb1.c1=tb2.c1
+ SET tb1.c2='geography'
+ WHERE tb1.c1 IN (SELECT c1 FROM tb2);
+
+let $query6b = DELETE FROM tb1 USING tb1 JOIN tb2
+ ON tb1.c1=tb2.c1
+ WHERE tb1.c1 IN (SELECT c1 FROM tb2);
+
+eval EXPLAIN EXTENDED $query6a;
+eval EXPLAIN EXTENDED $query6b;
+
+eval $query6a;
+SELECT * FROM tb1;
+ROLLBACK;
+eval $query6b;
+SELECT * FROM tb1;
+ROLLBACK;
+
+DROP TABLE tb1;
+DROP TABLE tb2;
+COMMIT;
+
+################### Clean up the remaining objects ########################################
+DROP TABLE ot1,ot2,ot3,it1,it2,it3;
+SET optimizer_switch=default;
+COMMIT;
No bundle (reason: useless for push emails).
| Thread |
|---|
| • bzr push into mysql-trunk branch (amit.bhattacharya:4452 to 4453) | Amit Bhattacharya | 11 Sep |
