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MDEV-6046: MySQL Bug#11766684 59851: UNINITIALISED VALUE IN ITEM_FUNC_LIKE::SELECT_OPTIMIZE WITH SUBQUERY AND

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2014-06-04 13:03:55 +03:00
parent 67bf16a48b
commit 113333d447
3 changed files with 35 additions and 13 deletions
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11
mysql-test/r/func_str.result
View File

@@ -2658,6 +2658,17 @@ group_concat( i ) field
NULL NULL NULL NULL
8 8
drop table t1; drop table t1;
#
# Bug#11766684 59851: UNINITIALISED VALUE IN ITEM_FUNC_LIKE::SELECT_OPTIMIZE WITH SUBQUERY AND
#
CREATE TABLE t2(a INT, KEY(a));
INSERT INTO t2 VALUES (1),(2);
CREATE TABLE t1(b INT, PRIMARY KEY(b));
INSERT INTO t1 VALUES (0),(254);
SELECT 1 FROM t2 WHERE a LIKE
(SELECT EXPORT_SET(1, b, b, b, b) FROM t1 LIMIT 1);
1
DROP TABLE t1, t2;
End of 5.1 tests End of 5.1 tests
# #
# Start of 5.3 tests # Start of 5.3 tests

12
mysql-test/t/func_str.test
View File

@@ -1407,6 +1407,18 @@ insert into t1 values (null),(8);
select group_concat( i ), make_set( i, 'a', 'b' ) field from t1 group by field; select group_concat( i ), make_set( i, 'a', 'b' ) field from t1 group by field;
drop table t1; drop table t1;
--echo #
--echo # Bug#11766684 59851: UNINITIALISED VALUE IN ITEM_FUNC_LIKE::SELECT_OPTIMIZE WITH SUBQUERY AND
--echo #
CREATE TABLE t2(a INT, KEY(a));
INSERT INTO t2 VALUES (1),(2);
CREATE TABLE t1(b INT, PRIMARY KEY(b));
INSERT INTO t1 VALUES (0),(254);
SELECT 1 FROM t2 WHERE a LIKE
(SELECT EXPORT_SET(1, b, b, b, b) FROM t1 LIMIT 1);
DROP TABLE t1, t2;
--echo End of 5.1 tests --echo End of 5.1 tests
--echo # --echo #

21
sql/item_cmpfunc.cc
View File

@@ -4896,21 +4896,20 @@ longlong Item_func_like::val_int()
Item_func::optimize_type Item_func_like::select_optimize() const Item_func::optimize_type Item_func_like::select_optimize() const
{ {
if (args[1]->const_item() && !args[1]->is_expensive()) if (!args[1]->const_item() || args[1]->is_expensive())
{ return OPTIMIZE_NONE;
String* res2= args[1]->val_str((String *)&cmp.value2); String* res2= args[1]->val_str((String *)&cmp.value2);
const char *ptr2; if (!res2)
if (!res2 || !(ptr2= res2->ptr()))
return OPTIMIZE_NONE; return OPTIMIZE_NONE;
if (*ptr2 != wild_many) if (!res2->length()) // Can optimize empty wildcard: column LIKE ''
{
if (args[0]->result_type() != STRING_RESULT || *ptr2 != wild_one)
return OPTIMIZE_OP; return OPTIMIZE_OP;
}
} DBUG_ASSERT(res2->ptr());
return OPTIMIZE_NONE; char first= res2->ptr()[0];
return (first == wild_many || first == wild_one) ?
OPTIMIZE_NONE : OPTIMIZE_OP;
} }