Commit 8c92143b authored by unknown's avatar unknown
Browse files

Bug #21019: First result of SELECT COUNT(*) different than consecutive runs 

  Correct merge
parent 048fbb84

mysql-test/r/select.result

+26 −26
Original line number Diff line number Diff line
@@ -2736,6 +2736,32 @@ SELECT i='1e+01',i=1e+01, i in (1e+01,1e+01), i in ('1e+01','1e+01') FROM t1; 
i='1e+01'	i=1e+01	i in (1e+01,1e+01)	i in ('1e+01','1e+01')

0	1	1	1

DROP TABLE t1;

CREATE TABLE t1 (a int, b int);

INSERT INTO t1 VALUES (1,1), (2,1), (4,10);

CREATE TABLE t2 (a int PRIMARY KEY, b int, KEY b (b));

INSERT INTO t2 VALUES (1,NULL), (2,10);

ALTER TABLE t1 ENABLE KEYS;

EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;

id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

1	SIMPLE	t2	index	b	b	5	NULL	2	Using index

1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where

SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;

a	b	a	b

1	NULL	1	1

1	NULL	2	1

1	NULL	4	10

2	10	4	10

EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;

id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

1	SIMPLE	t2	index	b	b	5	NULL	2	Using index

1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where

SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;

a	b	a	b

1	NULL	1	1

1	NULL	2	1

1	NULL	4	10

2	10	4	10

DROP TABLE IF EXISTS t1,t2;

CREATE TABLE t1 ( 

K2C4 varchar(4) character set latin1 collate latin1_bin NOT NULL default '', 

K4N4 varchar(4) character set latin1 collate latin1_bin NOT NULL default '0000',
@@ -3125,32 +3151,6 @@ select count(*) 
from t1 inner join (t2 right join t3 on t2.id = t3.b_id) on t1.id = t3.a_id;

count(*)

6

CREATE TABLE t1 (a int, b int);

INSERT INTO t1 VALUES (1,1), (2,1), (4,10);

CREATE TABLE t2 (a int PRIMARY KEY, b int, KEY b (b));

INSERT INTO t2 VALUES (1,NULL), (2,10);

ALTER TABLE t1 ENABLE KEYS;

EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;

id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

1	SIMPLE	t2	index	b	b	5	NULL	2	Using index

1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where

SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;

a	b	a	b

1	NULL	1	1

1	NULL	2	1

1	NULL	4	10

2	10	4	10

EXPLAIN SELECT STRAIGHT_JOIN SQL_NO_CACHE COUNT(*) FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;

id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra

1	SIMPLE	t2	index	b	b	5	NULL	2	Using index

1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	3	Using where

SELECT STRAIGHT_JOIN SQL_NO_CACHE * FROM t2, t1 WHERE t1.b = t2.b OR t2.b IS NULL;

a	b	a	b

1	NULL	1	1

1	NULL	2	1

1	NULL	4	10

2	10	4	10

DROP TABLE IF EXISTS t1,t2;

drop table t1,t2,t3;

create table t1 (a int);

create table t2 (b int);