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Fixed bug #23478.

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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
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@ -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;