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Fixed LP bug #806510.

Browse source 
The bug was caused by an incorrect code of the function
Item_direct_view_ref::replace_equal_field introduced in the
patch for bugs 717577, 724942. The function erroneously
returned the wrapped field instead of the Item_direct_view_ref
object itself in the cases when no replacement happened.

The bug masked two other minor bugs that could result in not
quite correct output of the EXPLAIN command for some queries.
They were fixed in the patch as well.
This commit is contained in:
Igor Babaev 2011-07-08 16:39:28 -07:00
commit 5ead4083ec
5 changed files with 100 additions and 4 deletions
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43
mysql-test/t/derived_view.test
View file

@ -460,3 +460,46 @@ SELECT t3.b, v1.a
DROP VIEW v1;
DROP TABLE t1,t2,t3;
--echo #
--echo # LP bug #806510: subquery with outer reference
--echo # to a derived_table/view
--echo #
CREATE TABLE t1 (a int) ;
INSERT INTO t1 VALUES (4), (NULL);
CREATE TABLE t2 (a int) ;
INSERT INTO t2 VALUES (8), (0);
CREATE TABLE t3 (a int, b int) ;
INSERT INTO t3 VALUES (7,8);
CREATE VIEW v1 AS SELECT * FROM t1;
SELECT * FROM t1 t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
EXPLAIN
SELECT * FROM t1 t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
SELECT * FROM (SELECT * FROM t1) t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
EXPLAIN
SELECT * FROM (SELECT * FROM t1) t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
SELECT * FROM v1 t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
EXPLAIN
SELECT * FROM v1 t
WHERE EXISTS (SELECT t3.a FROM t3, t2
WHERE t2.a = t3.b AND t.a != 0);
DROP VIEW v1;
DROP TABLE t1,t2,t3;