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Bug#54568: create view cause Assertion failed: 0,

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file .\item_subselect.cc, line 836
     
IN quantified predicates are never executed directly. They are rather wrapped
inside nodes called IN Optimizers (Item_in_optimizer) which take care of the
execution. However, this is not done during query preparation. Unfortunately
the LIKE predicate pre-evaluates constant right-hand side arguments even
during name resolution. Likely this is meant as an optimization.
      
Fixed by not pre-evaluating LIKE arguments in view prepare mode.

Back-ported to 5.0s
This commit is contained in:
Martin Hansson 2010-12-16 10:07:48 +01:00
parent 7e8ddb6b03
commit ff15ebdd5e
3 changed files with 38 additions and 1 deletions
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21
mysql-test/r/subselect4.result
View file

@ -59,3 +59,24 @@ FROM t3 WHERE 1 = 0 GROUP BY 1;
(SELECT 1 FROM t1,t2 WHERE t2.b > t3.b)
DROP TABLE t1,t2,t3;
End of 5.0 tests.
#
# Bug#54568: create view cause Assertion failed: 0,
# file .\item_subselect.cc, line 836
#
EXPLAIN SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1249 Select 2 was reduced during optimization
DESCRIBE SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1249 Select 2 was reduced during optimization
# None of the below should crash
CREATE VIEW v1 AS SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
CREATE VIEW v2 AS SELECT 1 LIKE '%' ESCAPE ( 1 IN ( SELECT 1 ) );
DROP VIEW v1, v2;
#
# End of 5.1 tests.
#

16
mysql-test/t/subselect4.test
View file

@ -62,3 +62,19 @@ FROM t3 WHERE 1 = 0 GROUP BY 1;
DROP TABLE t1,t2,t3;
--echo End of 5.0 tests.
--echo #
--echo # Bug#54568: create view cause Assertion failed: 0,
--echo # file .\item_subselect.cc, line 836
--echo #
EXPLAIN SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
DESCRIBE SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
--echo # None of the below should crash
CREATE VIEW v1 AS SELECT 1 LIKE ( 1 IN ( SELECT 1 ) );
CREATE VIEW v2 AS SELECT 1 LIKE '%' ESCAPE ( 1 IN ( SELECT 1 ) );
DROP VIEW v1, v2;
--echo #
--echo # End of 5.1 tests.
--echo #

2
sql/item_cmpfunc.cc
View file

@ -4248,7 +4248,7 @@ bool Item_func_like::fix_fields(THD *thd, Item **ref)
return TRUE;
}
if (escape_item->const_item())
if (escape_item->const_item() && !thd->lex->view_prepare_mode)
{
/* If we are on execution stage */
String *escape_str= escape_item->val_str(&tmp_value1);