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added mem_root switching for subselect if it is necessary

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(bug #518 fixed)


mysql-test/r/subselect.result:
  test of bug #518
mysql-test/t/subselect.test:
  test of bug #518
sql/item_subselect.cc:
  test and switch mem_root if it is necessary
  exec() - wrapper around engine->exec() to test and switch mem_root if necessary
sql/item_subselect.h:
  added storing THD for mem_root testinmg & switching
  exec() - wrapper around engine->exec() to test and switch mem_root if necessary
This commit is contained in:
unknown
2003-05-28 16:52:56 +03:00
parent 15b3f3a0d8
commit a100c0e951
4 changed files with 58 additions and 11 deletions
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14
mysql-test/r/subselect.result
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@ -1134,3 +1134,17 @@ id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ref salary salary 5 const 1 Using where
2 SUBQUERY NULL NULL NULL NULL NULL NULL NULL Select tables optimized away
drop table t1;
CREATE TABLE t1 (
ID int(10) unsigned NOT NULL auto_increment,
SUB_ID int(3) unsigned NOT NULL default '0',
REF_ID int(10) unsigned default NULL,
REF_SUB int(3) unsigned default '0',
PRIMARY KEY (ID,SUB_ID),
UNIQUE KEY t1_PK (ID,SUB_ID),
KEY t1_FK (REF_ID,REF_SUB),
KEY t1_REFID (REF_ID)
) TYPE=MyISAM CHARSET=cp1251;
INSERT INTO t1 VALUES (1,0,NULL,NULL),(2,0,NULL,NULL);
SELECT DISTINCT REF_ID FROM t1 WHERE ID= (SELECT DISTINCT REF_ID FROM t1 WHERE ID=2);
REF_ID
DROP TABLE t1;

14
mysql-test/t/subselect.test
View File

@ -716,3 +716,17 @@ create table t1 (id int not null auto_increment primary key, salary int, key(sal
insert into t1 (salary) values (100),(1000),(10000),(10),(500),(5000),(50000);
explain SELECT id FROM t1 where salary = (SELECT MAX(salary) FROM t1);
drop table t1;
CREATE TABLE t1 (
ID int(10) unsigned NOT NULL auto_increment,
SUB_ID int(3) unsigned NOT NULL default '0',
REF_ID int(10) unsigned default NULL,
REF_SUB int(3) unsigned default '0',
PRIMARY KEY (ID,SUB_ID),
UNIQUE KEY t1_PK (ID,SUB_ID),
KEY t1_FK (REF_ID,REF_SUB),
KEY t1_REFID (REF_ID)
) TYPE=MyISAM CHARSET=cp1251;
INSERT INTO t1 VALUES (1,0,NULL,NULL),(2,0,NULL,NULL);
SELECT DISTINCT REF_ID FROM t1 WHERE ID= (SELECT DISTINCT REF_ID FROM t1 WHERE ID=2);
DROP TABLE t1;