bk commit into 5.0 tree (sergefp:1.2523) BUG#30385

[Sergey Petrunia]

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ChangeSet@stripped, 2007-09-08 20:14:17+04:00, sergefp@stripped +3 -0
  BUG#30385: Server crash when deleting with ORDER BY and LIMIT
  in get_index_for_order(), don't walk over the end of the index key parts
  when matching index description and needed ordering.

  mysql-test/r/delete.result@stripped, 2007-09-08 20:14:13+04:00, sergefp@stripped +12 -0
    BUG#30385: Testcase

  mysql-test/t/delete.test@stripped, 2007-09-08 20:14:13+04:00, sergefp@stripped +16 -0
    BUG#30385: Testcase

  sql/opt_range.cc@stripped, 2007-09-08 20:14:13+04:00, sergefp@stripped +2 -1
    BUG#30385: Server crash when deleting with ORDER BY and LIMIT
    in get_index_for_order(), don't walk over the end of the index key parts
    when matching index description and needed ordering.

diff -Nrup a/mysql-test/r/delete.result b/mysql-test/r/delete.result
--- a/mysql-test/r/delete.result	2007-09-03 13:55:33 +04:00
+++ b/mysql-test/r/delete.result	2007-09-08 20:14:13 +04:00
@@ -260,3 +260,15 @@ a
 DROP TABLE t1, t2;
 DROP DATABASE db1;
 DROP DATABASE db2;
+CREATE TABLE t1 (
+`date` date ,
+`time` time ,
+`seq` int(10) unsigned NOT NULL auto_increment,
+PRIMARY KEY  (`seq`),
+KEY `seq` (`seq`),
+KEY `time` (`time`),
+KEY `date` (`date`)
+);
+DELETE FROM t1 ORDER BY date ASC, time ASC LIMIT 1;
+drop table t1;
+End of 5.0 tests
diff -Nrup a/mysql-test/t/delete.test b/mysql-test/t/delete.test
--- a/mysql-test/t/delete.test	2007-09-03 13:55:33 +04:00
+++ b/mysql-test/t/delete.test	2007-09-08 20:14:13 +04:00
@@ -265,3 +265,19 @@ SELECT * FROM t1;
 DROP TABLE t1, t2;
 DROP DATABASE db1;
 DROP DATABASE db2;
+
+# BUG#30385 "Server crash when deleting with order by and limit"
+CREATE TABLE t1 (
+  `date` date ,
+  `time` time ,
+  `seq` int(10) unsigned NOT NULL auto_increment,
+  PRIMARY KEY  (`seq`),
+  KEY `seq` (`seq`),
+  KEY `time` (`time`),
+  KEY `date` (`date`)
+);
+DELETE FROM t1 ORDER BY date ASC, time ASC LIMIT 1;
+drop table t1;
+
+-- echo End of 5.0 tests
+
diff -Nrup a/sql/opt_range.cc b/sql/opt_range.cc
--- a/sql/opt_range.cc	2007-08-15 19:37:11 +04:00
+++ b/sql/opt_range.cc	2007-09-08 20:14:13 +04:00
@@ -1619,6 +1619,7 @@ uint get_index_for_order(TABLE *table, O
     if (!(table->keys_in_use_for_query.is_set(idx)))
       continue;
     KEY_PART_INFO *keyinfo= table->key_info[idx].key_part;
+    uint n_parts=  table->key_info[idx].key_parts;
     uint partno= 0;
     
     /* 
@@ -1628,7 +1629,7 @@ uint get_index_for_order(TABLE *table, O
     */
     if (!(table->file->index_flags(idx, 0, 1) & HA_READ_ORDER))
       continue;
-    for (ord= order; ord; ord= ord->next, partno++)
+    for (ord= order; ord && partno < n_parts; ord= ord->next, partno++)
     {
       Item *item= order->item[0];
       if (!(item->type() == Item::FIELD_ITEM &&