[#MDEV-3876] Wrong result (extra rows) with ALL subquery from a MERGE view

The test case below returns different results when a query is run with a MERGE view comparing to a TEMPTABLE view or a base table. I believe that the TEMPTABLE/base table result is correct.
It can be related to ~~MDEV-3873~~, there are similarities.

CREATE TABLE t1 (a INT NOT NULL) ENGINE=MyISAM;

INSERT INTO t1 VALUES (1),(2);

CREATE TABLE t2 (b INT NOT NULL) ENGINE=MyISAM;

INSERT INTO t2 VALUES (1),(3);

CREATE OR REPLACE ALGORITHM=MERGE VIEW v AS SELECT * FROM t2;

SELECT a FROM t1 AS alias

WHERE a >= ALL (

SELECT b FROM t1 LEFT JOIN v ON (a = b)

WHERE a = alias.a );

Actual result:

----

Result with a TEMPTABLE view or a base table:
Result:

----

EXPLAIN with the MERGE view:

id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra

1	PRIMARY	alias	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where

2	DEPENDENT SUBQUERY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where

2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where; Using join buffer (flat, BNL join)

Warnings:

Note	1276	Field or reference 'test.alias.a' of SELECT #2 was resolved in SELECT #1

Note	1003	select `test`.`alias`.`a` AS `a` from `test`.`t1` `alias` where <not>(<expr_cache><`test`.`alias`.`a`>(<in_optimizer>(`test`.`alias`.`a`,<exists>(select `test`.`t2`.`b` from `test`.`t1` left join (`test`.`t2`) on((`test`.`t2`.`b` = `test`.`t1`.`a`)) where ((`test`.`t1`.`a` = `test`.`alias`.`a`) and (<cache>(`test`.`alias`.`a`) < `test`.`t2`.`b`))))))

branch: maria/5.3

bzr version-info

revision-id: sergii@pisem.net-20121117155015-4ab41ncach4iavao

date: 2012-11-17 16:50:15 +0100

revno: 3603

Also reproducible on MariaDB 5.5, 10.0.
Not reproducible on MariaDB 5.2, MySQL 5.5, 5.6.

[MDEV-3876] Wrong result (extra rows) with ALL subquery from a MERGE view Created: 2012-11-22 Updated: 2013-09-25 Resolved: 2012-11-23
Status:	Closed
Project:	MariaDB Server
Component/s:	None
Affects Version/s:	10.0.0, 5.5.28, 5.3.10
Fix Version/s:	10.0.1, 5.5.28a, 5.3.11

[MDEV-3876] Wrong result (extra rows) with ALL subquery from a MERGE view Created: 2012-11-22 Updated: 2013-09-25 Resolved: 2012-11-23