bk commit into 5.0 tree (igor:1.2021) BUG#16016

[igor]

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ChangeSet
  1.2021 06/01/06 22:28:26 igor@stripped +3 -0
  Fixed bug #16016: MIN/MAX optimization was not applied to views.

  sql/opt_sum.cc
    1.49 06/01/06 22:28:02 igor@stripped +5 -5
    Fixed bug #16016: MIN/MAX optimization was not applied to views.
    The fix employs the standard way of handling direct references to view fields.

  mysql-test/t/view.test
    1.132 06/01/06 22:28:02 igor@stripped +24 -0
    Added a test case for bug #16016.

  mysql-test/r/view.result
    1.143 06/01/06 22:28:02 igor@stripped +29 -0
    Added a test case for bug #16016.

# This is a BitKeeper patch.  What follows are the unified diffs for the
# set of deltas contained in the patch.  The rest of the patch, the part
# that BitKeeper cares about, is below these diffs.
# User:	igor
# Host:	rurik.mysql.com
# Root:	/home/igor/dev/mysql-5.0-0

--- 1.48/sql/opt_sum.cc	2005-09-28 02:34:49 -07:00
+++ 1.49/sql/opt_sum.cc	2006-01-06 22:28:02 -08:00
@@ -180,14 +180,14 @@
           indexes to find the key.
         */
         Item *expr=item_sum->args[0];
-        if (expr->type() == Item::FIELD_ITEM)
+        if (expr->real_item()->type() == Item::FIELD_ITEM)
         {
           byte key_buff[MAX_KEY_LENGTH];
           TABLE_REF ref;
           uint range_fl, prefix_len;
 
           ref.key_buff= key_buff;
-          Item_field *item_field= ((Item_field*) expr);
+          Item_field *item_field= (Item_field*) (expr->real_item());
           TABLE *table= item_field->field->table;
 
           /* 
@@ -267,14 +267,14 @@
           indexes to find the key.
         */
         Item *expr=item_sum->args[0];
-        if (expr->type() == Item::FIELD_ITEM)
+        if (expr->real_item()->type() == Item::FIELD_ITEM)
         {
           byte key_buff[MAX_KEY_LENGTH];
           TABLE_REF ref;
-	      uint range_fl, prefix_len;
+          uint range_fl, prefix_len;
 
           ref.key_buff= key_buff;
-	      Item_field *item_field= ((Item_field*) expr);
+          Item_field *item_field= (Item_field*) (expr->real_item());
           TABLE *table= item_field->field->table;
 
           /* 

--- 1.142/mysql-test/r/view.result	2006-01-05 14:49:22 -08:00
+++ 1.143/mysql-test/r/view.result	2006-01-06 22:28:02 -08:00
@@ -2475,3 +2475,32 @@
 5	5
 drop view v2, v1;
 drop table t1;
+CREATE TABLE t1 (a int PRIMARY KEY, b int);
+INSERT INTO t1 VALUES (2,20), (3,10), (1,10), (0,30), (5,10);
+CREATE VIEW v1 AS SELECT * FROM t1;
+SELECT MAX(a) FROM t1;
+MAX(a)
+5
+SELECT MAX(a) FROM v1;
+MAX(a)
+5
+EXPLAIN SELECT MAX(a) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+EXPLAIN SELECT MAX(a) FROM v1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+SELECT MIN(a) FROM t1;
+MIN(a)
+0
+SELECT MIN(a) FROM v1;
+MIN(a)
+0
+EXPLAIN SELECT MIN(a) FROM t1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+EXPLAIN SELECT MIN(a) FROM v1;
+id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
+1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
+DROP VIEW v1;
+DROP TABLE t1;

--- 1.131/mysql-test/t/view.test	2006-01-05 14:49:22 -08:00
+++ 1.132/mysql-test/t/view.test	2006-01-06 22:28:02 -08:00
@@ -2339,3 +2339,27 @@
 
 drop view v2, v1;
 drop table t1;
+
+#
+# Bug#16016: MIN/MAX optimization for views
+#
+
+CREATE TABLE t1 (a int PRIMARY KEY, b int);
+INSERT INTO t1 VALUES (2,20), (3,10), (1,10), (0,30), (5,10);
+
+CREATE VIEW v1 AS SELECT * FROM t1;
+
+SELECT MAX(a) FROM t1;
+SELECT MAX(a) FROM v1;
+
+EXPLAIN SELECT MAX(a) FROM t1;
+EXPLAIN SELECT MAX(a) FROM v1;
+
+SELECT MIN(a) FROM t1;
+SELECT MIN(a) FROM v1;
+
+EXPLAIN SELECT MIN(a) FROM t1;
+EXPLAIN SELECT MIN(a) FROM v1;
+
+DROP VIEW v1;
+DROP TABLE t1;