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| author | Evgeny Potemkin <epotemkin@mysql.com> | 2009-07-16 19:43:46 +0400 |
|---|---|---|
| committer | Evgeny Potemkin <epotemkin@mysql.com> | 2009-07-16 19:43:46 +0400 |
| commit | 63e6a59d7398673c32a00ed163f76420a85120dd (patch) | |
| tree | 70f908568600351a2f29c48fc9e45f808edc942a /mysql-test/r/subselect.result | |
| parent | 924c8c5bfbc346de72d27a06fa5d6cb87b471c08 (diff) | |
| download | mariadb-git-63e6a59d7398673c32a00ed163f76420a85120dd.tar.gz | |
Bug#46051: Incorrectly market field caused wrong result.
In a subselect all fields from outer selects are marked as dependent on
selects they are belong to. In some cases optimizer substitutes it for an
equivalent expression. For example "a_field IN (SELECT outer_field)" is
substituted with "a_field = outer_field". As we moved the outer_field to the
upper select it's not really outer anymore. But it was left marked as outer.
If exists an index over a_field optimizer choose wrong execution plan and thus
return wrong result.
Now the Item_in_subselect::single_value_transformer function removes dependent
marking from fields when a subselect is optimized away.
mysql-test/r/subselect.result:
Added a test case for the bug#46051.
mysql-test/t/subselect.test:
Added a test case for the bug#46051.
sql/item_subselect.cc:
Bug#46051: Incorrectly market field caused wrong result.
Now the Item_in_subselect::single_value_transformer function removes dependent
marking from fields when a subselect is optimized away.
Diffstat (limited to 'mysql-test/r/subselect.result')
| -rw-r--r-- | mysql-test/r/subselect.result | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/mysql-test/r/subselect.result b/mysql-test/r/subselect.result index 671e5d8f532..d3f7f631f70 100644 --- a/mysql-test/r/subselect.result +++ b/mysql-test/r/subselect.result @@ -4452,4 +4452,30 @@ WHERE 1 IN (SELECT id FROM t1) WITH CHECK OPTION; DELETE FROM v3; DROP VIEW v1,v2,v3; DROP TABLE t1,t2; +# +# Bug#45061: Incorrectly market field caused wrong result. +# +CREATE TABLE `C` ( +`int_nokey` int(11) NOT NULL, +`int_key` int(11) NOT NULL, +KEY `int_key` (`int_key`) +); +INSERT INTO `C` VALUES (9,9), (0,0), (8,6), (3,6), (7,6), (0,4), +(1,7), (9,4), (0,8), (9,4), (0,7), (5,5), (0,0), (8,5), (8,7), +(5,2), (1,8), (7,0), (0,9), (9,5); +SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`); +int_nokey int_key +9 9 +0 0 +5 5 +0 0 +EXPLAIN EXTENDED SELECT * FROM C WHERE `int_key` IN (SELECT `int_nokey`); +id select_type table type possible_keys key key_len ref rows Extra +1 PRIMARY C ALL NULL NULL NULL NULL 20 Using where +Warnings: +Note 1276 Field or reference 'test.C.int_nokey' of SELECT #2 was resolved in SELECT #1 +Note 1249 Select 2 was reduced during optimization +Note 1003 select `test`.`C`.`int_nokey` AS `int_nokey`,`test`.`C`.`int_key` AS `int_key` from `test`.`C` where (`test`.`C`.`int_nokey` = `test`.`C`.`int_key`) +DROP TABLE C; +# End of test for bug#45061. End of 5.0 tests. |