Wrong result (extra rows) with FROM subquery inside ALL subquery, LEFT JOIN, derived_merge

SET optimizer_switch = 'derived_merge=on,in_to_exists=on';

CREATE TABLE t1 (a INT) ENGINE=MyISAM;

INSERT INTO t1 VALUES (4),(8);

CREATE TABLE t2 (b INT) ENGINE=MyISAM;

INSERT INTO t2 VALUES (7),(0);

CREATE TABLE t3 (c INT, d INT NOT NULL) ENGINE=MyISAM;

INSERT INTO t3 VALUES (0,4),(8,6);

SELECT * FROM t1

WHERE a >= ALL ( 

SELECT d FROM t2 LEFT JOIN ( SELECT * FROM t3 ) AS alias ON ( c = b ) 

WHERE b >= a 

);

a

---

4

8

SELECT * FROM t1

WHERE a >= ALL ( SELECT d FROM t2 LEFT JOIN t3 ON ( c = b ) WHERE b >= a );

a

---

8

CREATE ALGORITHM=MERGE VIEW v AS SELECT * FROM t3;

SELECT * FROM t1 WHERE a >= ALL ( 

SELECT d FROM t2 LEFT JOIN v ON ( c = b ) 

WHERE b >= a 

);

a

---

8

CREATE OR REPLACE ALGORITHM=TEMPTABLE VIEW v AS SELECT * FROM t3;

SELECT * FROM t1 WHERE a >= ALL (

SELECT d FROM t2 LEFT JOIN v ON ( c = b )

WHERE b >= a

);

a

---

8

branch: maria/5.3

revision-id: sergii@pisem.net-20121123121131-p4nfv8j2cbh68dbg

date: 2012-11-23 13:11:31 +0100

revno: 3605

index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on

EXPLAIN EXTENDED

SELECT * FROM t1 

WHERE a >= ALL ( 

SELECT d FROM t2 LEFT JOIN ( SELECT * FROM t3 ) AS alias ON ( c = b ) 

WHERE b >= a 

);

id	select_type	table	type	possible_keys	key	key_len	ref	rows	filtered	Extra

1	PRIMARY	t1	ALL	NULL	NULL	NULL	NULL	2	100.00	Using where

2	DEPENDENT SUBQUERY	t2	ALL	NULL	NULL	NULL	NULL	2100.00	Using where

2	DEPENDENT SUBQUERY	t3	ALL	NULL	NULL	NULL	NULL	2100.00	Using where; Using join buffer (flat, BNL join)

Warnings:

Note	1276	Field or reference 'test.t1.a' of SELECT #2 was resolved in SELECT #1

Note	1003	select `test`.`t1`.`a` AS `a` from `test`.`t1` where <not>(<expr_cache><`test`.`t1`.`a`>(<in_optimizer>(`test`.`t1`.`a`,<exists>(select `test`.`t3`.`d` from `test`.`t2` left join (`test`.`t3`) on((`test`.`t3`.`c` = `test`.`t2`.`b`)) where ((`test`.`t2`.`b` >= `test`.`t1`.`a`) and trigcond((<cache>(`test`.`t1`.`a`) < `test`.`t3`.`d`)))))))