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fix for LP bug#994392

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The not_null_tables() of Item_func_not_all and Item_in_optimizer was inherited from
Item_func by mistake. It made the optimizer think that  subquery
predicates with ALL/ANY/IN were null-rejecting. This could trigger invalid
conversions of outer joins into inner joins.
This commit is contained in:
unknown
2012-05-11 09:35:46 +03:00
parent 6fc863c749
commit f2cbc014d9
3 changed files with 45 additions and 0 deletions
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24
mysql-test/r/join_outer.result
View File

@ -1596,3 +1596,27 @@ f
1
DROP TABLE t1;
End of 5.1 tests
#
# LP BUG#994392: Wrong result with RIGHT/LEFT JOIN and ALL subquery
# predicate in WHERE condition.
#
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES(9);
CREATE TABLE t2(b INT);
INSERT INTO t2 VALUES(8);
CREATE TABLE t3(c INT);
INSERT INTO t3 VALUES(3);
SELECT * FROM t2 RIGHT JOIN t3 ON(c = b) WHERE b < ALL(SELECT a FROM t1 WHERE a <= 7);
b c
NULL 3
SELECT * FROM t3 LEFT JOIN t2 ON(c = b) WHERE b < ALL(SELECT a FROM t1 WHERE a <= 7);
c b
3 NULL
SELECT * FROM t2 RIGHT JOIN t3 ON(c = b) WHERE b not in (SELECT a FROM t1 WHERE a <= 7);
b c
NULL 3
SELECT * FROM t3 LEFT JOIN t2 ON(c = b) WHERE b not in (SELECT a FROM t1 WHERE a <= 7);
c b
3 NULL
drop table t1,t2,t3;
End of 5.2 tests

19
mysql-test/t/join_outer.test
View File

@ -1162,3 +1162,22 @@ DROP TABLE t1;
--echo End of 5.1 tests
--echo #
--echo # LP BUG#994392: Wrong result with RIGHT/LEFT JOIN and ALL subquery
--echo # predicate in WHERE condition.
--echo #
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES(9);
CREATE TABLE t2(b INT);
INSERT INTO t2 VALUES(8);
CREATE TABLE t3(c INT);
INSERT INTO t3 VALUES(3);
SELECT * FROM t2 RIGHT JOIN t3 ON(c = b) WHERE b < ALL(SELECT a FROM t1 WHERE a <= 7);
SELECT * FROM t3 LEFT JOIN t2 ON(c = b) WHERE b < ALL(SELECT a FROM t1 WHERE a <= 7);
SELECT * FROM t2 RIGHT JOIN t3 ON(c = b) WHERE b not in (SELECT a FROM t1 WHERE a <= 7);
SELECT * FROM t3 LEFT JOIN t2 ON(c = b) WHERE b not in (SELECT a FROM t1 WHERE a <= 7);
drop table t1,t2,t3;
--echo End of 5.2 tests

2
sql/item_cmpfunc.h
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@ -257,6 +257,7 @@ public:
{}
bool fix_fields(THD *, Item **);
bool fix_left(THD *thd, Item **ref);
table_map not_null_tables() const { return 0; }
bool is_null();
longlong val_int();
void cleanup();
@ -473,6 +474,7 @@ public:
show(0)
{}
virtual void top_level_item() { abort_on_null= 1; }
table_map not_null_tables() const { return 0; }
bool top_level() { return abort_on_null; }
longlong val_int();
enum Functype functype() const { return NOT_ALL_FUNC; }