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Fixed bug mdev-5686.

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The calls of the function remove_eq_conds() may change the and/or structure
of the where conditions. So JOIN::equal_cond should be updated for non-recursive
calls of remove_eq_conds().
This commit is contained in:
Igor Babaev 2014-03-06 13:56:34 -08:00
parent 3e03c9eae9
commit 1f2ef57403
3 changed files with 50 additions and 1 deletions
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22
mysql-test/r/subselect4.result
View file

@ -2375,5 +2375,27 @@ ORDER BY v2.id;
id a2 a3 id a2 a3
DROP VIEW v2;
DROP TABLE t1,t2;
#
# MDEV-5686: degenerate disjunct in NOT IN subquery
#
CREATE TABLE t1 (a int, b int, c varchar(3)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1,1,'CAN'),(2,2,'AUS');
CREATE TABLE t2 (f int) ENGINE=MyISAM;
INSERT INTO t2 VALUES (3);
EXPLAIN EXTENDED
SELECT * FROM t2
WHERE f NOT IN (SELECT b FROM t1
WHERE 0 OR (c IN ('USA') OR c NOT IN ('USA')) AND a = b);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY t2 system NULL NULL NULL NULL 1 100.00
2 DEPENDENT SUBQUERY t1 ALL NULL NULL NULL NULL 2 100.00 Using where
Warnings:
Note 1003 select 3 AS `f` from `test`.`t2` where (not(<expr_cache><3>(<in_optimizer>(3,<exists>(select `test`.`t1`.`b` from `test`.`t1` where (((`test`.`t1`.`c` = 'USA') or (`test`.`t1`.`c` <> 'USA')) and trigcond(((<cache>(3) = `test`.`t1`.`b`) or isnull(`test`.`t1`.`b`))) and (`test`.`t1`.`b` = `test`.`t1`.`a`)) having trigcond(<is_not_null_test>(`test`.`t1`.`b`)))))))
SELECT * FROM t2
WHERE f NOT IN (SELECT b FROM t1
WHERE 0 OR (c IN ('USA') OR c NOT IN ('USA')) AND a = b);
f
3
DROP TABLE t1,t2;
SET optimizer_switch= @@global.optimizer_switch;
set @@tmp_table_size= @@global.tmp_table_size;

21
mysql-test/t/subselect4.test
View file

@ -1970,5 +1970,26 @@ ORDER BY v2.id;
DROP VIEW v2;
DROP TABLE t1,t2;
--echo #
--echo # MDEV-5686: degenerate disjunct in NOT IN subquery
--echo #
CREATE TABLE t1 (a int, b int, c varchar(3)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1,1,'CAN'),(2,2,'AUS');
CREATE TABLE t2 (f int) ENGINE=MyISAM;
INSERT INTO t2 VALUES (3);
EXPLAIN EXTENDED
SELECT * FROM t2
WHERE f NOT IN (SELECT b FROM t1
WHERE 0 OR (c IN ('USA') OR c NOT IN ('USA')) AND a = b);
SELECT * FROM t2
WHERE f NOT IN (SELECT b FROM t1
WHERE 0 OR (c IN ('USA') OR c NOT IN ('USA')) AND a = b);
DROP TABLE t1,t2;
SET optimizer_switch= @@global.optimizer_switch;
set @@tmp_table_size= @@global.tmp_table_size;

8
sql/sql_select.cc
View file

@ -3530,6 +3530,9 @@ make_join_statistics(JOIN *join, List<TABLE_LIST> &tables_list,
{
conds->update_used_tables();
conds= remove_eq_conds(join->thd, conds, &join->cond_value);
if (conds && conds->type() == Item::COND_ITEM &&
((Item_cond*) conds)->functype() == Item_func::COND_AND_FUNC)
join->cond_equal= &((Item_cond_and*) conds)->cond_equal;
join->select_lex->where= conds;
if (join->cond_value == Item::COND_FALSE)
{
@ -13228,7 +13231,10 @@ optimize_cond(JOIN *join, COND *conds,
Remove all and-levels where CONST item != CONST item
*/
DBUG_EXECUTE("where",print_where(conds,"after const change", QT_ORDINARY););
conds= remove_eq_conds(thd, conds, cond_value) ;
conds= remove_eq_conds(thd, conds, cond_value);
if (conds && conds->type() == Item::COND_ITEM &&
((Item_cond*) conds)->functype() == Item_func::COND_AND_FUNC)
join->cond_equal= &((Item_cond_and*) conds)->cond_equal;
DBUG_EXECUTE("info",print_where(conds,"after remove", QT_ORDINARY););
}
DBUG_RETURN(conds);