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Fixed bug #23478.

Browse source 
If elements a not top-level IN subquery were accessed by an index and 
the subquery result set included  a NULL value then the quantified
predicate that contained the subquery was evaluated to NULL when 
it should return a non-null value.
This commit is contained in:
igor@rurik.mysql.com 2006-10-19 23:05:53 -07:00
parent 1dacdd4c85
commit d8b6f46a39
3 changed files with 35 additions and 0 deletions
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15
mysql-test/r/subselect.result
View file

@ -2982,3 +2982,18 @@ field1 field2
1 1
1 3
DROP TABLE t1, t2;
CREATE TABLE t1(a int, INDEX (a));
INSERT INTO t1 VALUES (1), (3), (5), (7);
INSERT INTO t1 VALUES (NULL);
CREATE TABLE t2(a int);
INSERT INTO t2 VALUES (1),(2),(3);
EXPLAIN SELECT a, a IN (SELECT a FROM t1) FROM t2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 3
2 DEPENDENT SUBQUERY t1 index_subquery a a 5 func 2 Using index
SELECT a, a IN (SELECT a FROM t1) FROM t2;
a a IN (SELECT a FROM t1)
1 1
2 NULL
3 1
DROP TABLE t1,t2;

17
mysql-test/t/subselect.test
View file

@ -1948,4 +1948,21 @@ SELECT field1, field2
DROP TABLE t1, t2;
#
# Bug #23478: not top-level IN subquery returning a non-empty result set
# with possible NULL values by index access from the outer query
#
CREATE TABLE t1(a int, INDEX (a));
INSERT INTO t1 VALUES (1), (3), (5), (7);
INSERT INTO t1 VALUES (NULL);
CREATE TABLE t2(a int);
INSERT INTO t2 VALUES (1),(2),(3);
EXPLAIN SELECT a, a IN (SELECT a FROM t1) FROM t2;
SELECT a, a IN (SELECT a FROM t1) FROM t2;
DROP TABLE t1,t2;
# End of 4.1 tests

3
sql/item_subselect.cc
View file

@ -610,6 +610,7 @@ double Item_in_subselect::val()
*/
DBUG_ASSERT(0);
DBUG_ASSERT(fixed == 1);
null_value= 0;
if (exec())
{
reset();
@ -625,6 +626,7 @@ double Item_in_subselect::val()
longlong Item_in_subselect::val_int()
{
DBUG_ASSERT(fixed == 1);
null_value= 0;
if (exec())
{
reset();
@ -645,6 +647,7 @@ String *Item_in_subselect::val_str(String *str)
*/
DBUG_ASSERT(0);
DBUG_ASSERT(fixed == 1);
null_value= 0;
if (exec())
{
reset();