set @save_default_storage_engine=@@global.default_storage_engine;
set global default_storage_engine=myisam;
set session default_storage_engine=myisam;
create table t1 (a int not null primary key auto_increment, message char(20));
create table t2 (a int not null primary key auto_increment, message char(20));
INSERT INTO t1 (message) VALUES ("Testing"),("table"),("t1");
INSERT INTO t2 (message) VALUES ("Testing"),("table"),("t2");
create table t3 (a int not null, b char(20), key(a)) engine=MERGE UNION=(t1,t2);
select * from t3;
a	b
1	Testing
2	table
3	t1
1	Testing
2	table
3	t2
select * from t3 order by a desc;
a	b
3	t1
3	t2
2	table
2	table
1	Testing
1	Testing
drop table t3;
insert into t1 select NULL,message from t2;
insert into t2 select NULL,message from t1;
insert into t1 select NULL,message from t2;
insert into t2 select NULL,message from t1;
insert into t1 select NULL,message from t2;
insert into t2 select NULL,message from t1;
insert into t1 select NULL,message from t2;
insert into t2 select NULL,message from t1;
insert into t1 select NULL,message from t2;
insert into t2 select NULL,message from t1;
insert into t1 select NULL,message from t2;
create table t3 (a int not null, b char(20), key(a)) engine=MERGE UNION=(test.t1,test.t2);
explain select * from t3 where a < 10;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	range	a	a	4	NULL	17	Using where
explain select * from t3 where a > 10 and a < 20;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	range	a	a	4	NULL	17	Using where
select * from t3 where a = 10;
a	b
10	Testing
10	Testing
select * from t3 where a < 10;
a	b
1	Testing
1	Testing
2	table
2	table
3	t1
3	t2
4	Testing
4	Testing
5	table
5	table
6	t2
6	t1
7	Testing
7	Testing
8	table
8	table
9	t2
9	t2
select * from t3 where a > 10 and a < 20;
a	b
11	table
11	table
12	t1
12	t1
13	Testing
13	Testing
14	table
14	table
15	t2
15	t2
16	Testing
16	Testing
17	table
17	table
18	t2
18	t2
19	Testing
19	Testing
explain select a from t3 order by a desc limit 10;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	index	NULL	a	4	NULL	10	Using index
select a from t3 order by a desc limit 10;
a
699
698
697
696
695
694
693
692
691
690
select a from t3 order by a desc limit 300,10;
a
416
415
415
414
414
413
413
412
412
411
delete from t3 where a=3;
select * from t3 where a < 10;
a	b
1	Testing
1	Testing
2	table
2	table
4	Testing
4	Testing
5	table
5	table
6	t2
6	t1
7	Testing
7	Testing
8	table
8	table
9	t2
9	t2
delete from t3 where a >= 6 and a <= 8;
select * from t3 where a < 10;
a	b
1	Testing
1	Testing
2	table
2	table
4	Testing
4	Testing
5	table
5	table
9	t2
9	t2
update t3 set a=3 where a=9;
select * from t3 where a < 10;
a	b
1	Testing
1	Testing
2	table
2	table
3	t2
3	t2
4	Testing
4	Testing
5	table
5	table
update t3 set a=6 where a=7;
select * from t3 where a < 10;
a	b
1	Testing
1	Testing
2	table
2	table
3	t2
3	t2
4	Testing
4	Testing
5	table
5	table
show create table t3;
Table	Create Table
t3	CREATE TABLE `t3` (
  `a` int(11) NOT NULL,
  `b` char(20) DEFAULT NULL,
  KEY `a` (`a`)
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`t1`,`t2`)
create table t4 (a int not null, b char(10), key(a)) engine=MERGE UNION=(t1,t2);
select * from t4;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
alter table t4 add column c int;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
flush tables;
select * from t4;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
create database mysqltest;
create table mysqltest.t6 (a int not null primary key auto_increment, message char(20));
create table t5 (a int not null, b char(20), key(a)) engine=MERGE UNION=(test.t1,mysqltest.t6);
show create table t5;
Table	Create Table
t5	CREATE TABLE `t5` (
  `a` int(11) NOT NULL,
  `b` char(20) DEFAULT NULL,
  KEY `a` (`a`)
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`t1`,`mysqltest`.`t6`)
alter table t5 engine=myisam;
drop table t5, mysqltest.t6;
drop database mysqltest;
drop table t4,t3,t1,t2;
create table t1 (c char(10)) engine=myisam;
create table t2 (c char(10)) engine=myisam;
create table t3 (c char(10)) union=(t1,t2) engine=merge;
insert into t1 (c) values ('test1');
insert into t1 (c) values ('test1');
insert into t1 (c) values ('test1');
insert into t2 (c) values ('test2');
insert into t2 (c) values ('test2');
insert into t2 (c) values ('test2');
select * from t3;
c
test1
test1
test1
test2
test2
test2
select * from t3;
c
test1
test1
test1
test2
test2
test2
delete from t3 where 1=1;
select * from t3;
c
select * from t1;
c
drop table t3,t2,t1;
CREATE TABLE t1 (incr int not null, othr int not null, primary key(incr));
CREATE TABLE t2 (incr int not null, othr int not null, primary key(incr));
CREATE TABLE t3 (incr int not null, othr int not null, primary key(incr))
ENGINE=MERGE UNION=(t1,t2);
SELECT * from t3;
incr	othr
INSERT INTO t1 VALUES ( 1,10),( 3,53),( 5,21),( 7,12),( 9,17);
INSERT INTO t2 VALUES ( 2,24),( 4,33),( 6,41),( 8,26),( 0,32);
INSERT INTO t1 VALUES (11,20),(13,43),(15,11),(17,22),(19,37);
INSERT INTO t2 VALUES (12,25),(14,31),(16,42),(18,27),(10,30);
SELECT * from t3 where incr in (1,2,3,4) order by othr;
incr	othr
1	10
2	24
4	33
3	53
alter table t3 UNION=(t1);
select count(*) from t3;
count(*)
10
alter table t3 UNION=(t1,t2);
select count(*) from t3;
count(*)
20
alter table t3 ENGINE=MYISAM;
select count(*) from t3;
count(*)
20
drop table t3;
CREATE TABLE t3 (incr int not null, othr int not null, primary key(incr))
ENGINE=MERGE UNION=(t1,t2);
show create table t3;
Table	Create Table
t3	CREATE TABLE `t3` (
  `incr` int(11) NOT NULL,
  `othr` int(11) NOT NULL,
  PRIMARY KEY (`incr`)
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`t1`,`t2`)
alter table t3 drop primary key;
show create table t3;
Table	Create Table
t3	CREATE TABLE `t3` (
  `incr` int(11) NOT NULL,
  `othr` int(11) NOT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`t1`,`t2`)
drop table t3,t2,t1;
create table t1 (a int not null, key(a)) engine=merge;
select * from t1;
a
drop table t1;
create table t1 (a int not null, b int not null, key(a,b));
create table t2 (a int not null, b int not null, key(a,b));
create table t3 (a int not null, b int not null, key(a,b)) ENGINE=MERGE UNION=(t1,t2);
insert into t1 values (1,2),(2,1),(0,0),(4,4),(5,5),(6,6);
insert into t2 values (1,1),(2,2),(0,0),(4,4),(5,5),(6,6);
flush tables;
select * from t3 where a=1 order by b limit 2;
a	b
1	1
1	2
drop table t3,t1,t2;
create table t1 (a int not null, b int not null auto_increment, primary key(a,b));
create table t2 (a int not null, b int not null auto_increment, primary key(a,b));
create table t3 (a int not null, b int not null, key(a,b)) UNION=(t1,t2) INSERT_METHOD=NO;
create table t4 (a int not null, b int not null, key(a,b)) ENGINE=MERGE UNION=(t1,t2) INSERT_METHOD=NO;
create table t5 (a int not null, b int not null auto_increment, primary key(a,b)) ENGINE=MERGE UNION=(t1,t2) INSERT_METHOD=FIRST;
create table t6 (a int not null, b int not null auto_increment, primary key(a,b)) ENGINE=MERGE UNION=(t1,t2) INSERT_METHOD=LAST;
show create table t3;
Table	Create Table
t3	CREATE TABLE `t3` (
  `a` int(11) NOT NULL,
  `b` int(11) NOT NULL,
  KEY `a` (`a`,`b`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
show create table t4;
Table	Create Table
t4	CREATE TABLE `t4` (
  `a` int(11) NOT NULL,
  `b` int(11) NOT NULL,
  KEY `a` (`a`,`b`)
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`t1`,`t2`)
show create table t5;
Table	Create Table
t5	CREATE TABLE `t5` (
  `a` int(11) NOT NULL,
  `b` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`a`,`b`)
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=FIRST UNION=(`t1`,`t2`)
show create table t6;
Table	Create Table
t6	CREATE TABLE `t6` (
  `a` int(11) NOT NULL,
  `b` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`a`,`b`)
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
insert into t1 values (1,NULL),(1,NULL),(1,NULL),(1,NULL);
insert into t2 values (2,NULL),(2,NULL),(2,NULL),(2,NULL);
select * from t3 order by b,a limit 3;
a	b
select * from t4 order by b,a limit 3;
a	b
1	1
2	1
1	2
select * from t5 order by b,a limit 3,3;
a	b
2	2
1	3
2	3
select * from t6 order by b,a limit 6,3;
a	b
1	4
2	4
insert into t5 values (5,1),(5,2);
insert into t6 values (6,1),(6,2);
select * from t1 order by a,b;
a	b
1	1
1	2
1	3
1	4
5	1
5	2
select * from t2 order by a,b;
a	b
2	1
2	2
2	3
2	4
6	1
6	2
select * from t4 order by a,b;
a	b
1	1
1	2
1	3
1	4
2	1
2	2
2	3
2	4
5	1
5	2
6	1
6	2
insert into t3 values (3,1),(3,2),(3,3),(3,4);
select * from t3 order by a,b;
a	b
3	1
3	2
3	3
3	4
alter table t4 UNION=(t1,t2,t3);
show create table t4;
Table	Create Table
t4	CREATE TABLE `t4` (
  `a` int(11) NOT NULL,
  `b` int(11) NOT NULL,
  KEY `a` (`a`,`b`)
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`t1`,`t2`,`t3`)
select * from t4 order by a,b;
a	b
1	1
1	2
1	3
1	4
2	1
2	2
2	3
2	4
3	1
3	2
3	3
3	4
5	1
5	2
6	1
6	2
alter table t4 INSERT_METHOD=FIRST;
show create table t4;
Table	Create Table
t4	CREATE TABLE `t4` (
  `a` int(11) NOT NULL,
  `b` int(11) NOT NULL,
  KEY `a` (`a`,`b`)
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=FIRST UNION=(`t1`,`t2`,`t3`)
insert into t4 values (4,1),(4,2);
select * from t1 order by a,b;
a	b
1	1
1	2
1	3
1	4
4	1
4	2
5	1
5	2
select * from t2 order by a,b;
a	b
2	1
2	2
2	3
2	4
6	1
6	2
select * from t3 order by a,b;
a	b
3	1
3	2
3	3
3	4
select * from t4 order by a,b;
a	b
1	1
1	2
1	3
1	4
2	1
2	2
2	3
2	4
3	1
3	2
3	3
3	4
4	1
4	2
5	1
5	2
6	1
6	2
select * from t5 order by a,b;
a	b
1	1
1	2
1	3
1	4
2	1
2	2
2	3
2	4
4	1
4	2
5	1
5	2
6	1
6	2
select 1;
1
1
insert into t5 values (1,NULL),(5,NULL);
insert into t6 values (2,NULL),(6,NULL);
select * from t1 order by a,b;
a	b
1	1
1	2
1	3
1	4
1	5
4	1
4	2
5	1
5	2
5	3
select * from t2 order by a,b;
a	b
2	1
2	2
2	3
2	4
2	5
6	1
6	2
6	3
select * from t5 order by a,b;
a	b
1	1
1	2
1	3
1	4
1	5
2	1
2	2
2	3
2	4
2	5
4	1
4	2
5	1
5	2
5	3
6	1
6	2
6	3
select * from t6 order by a,b;
a	b
1	1
1	2
1	3
1	4
1	5
2	1
2	2
2	3
2	4
2	5
4	1
4	2
5	1
5	2
5	3
6	1
6	2
6	3
insert into t1 values (99,NULL);
select * from t4 where a+0 > 90;
a	b
99	1
insert t5 values (1,1);
ERROR 23000: Duplicate entry '1-1' for key 'PRIMARY'
insert t6 values (2,1);
ERROR 23000: Duplicate entry '2-1' for key 'PRIMARY'
insert t5 values (1,1) on duplicate key update b=b+10;
insert t6 values (2,1) on duplicate key update b=b+20;
select * from t5 where a < 3;
a	b
1	2
1	3
1	4
1	5
1	11
2	2
2	3
2	4
2	5
2	21
drop table t6, t5, t4, t3, t2, t1;
CREATE TABLE t1 (  a int(11) NOT NULL default '0',  b int(11) NOT NULL default '0',  PRIMARY KEY  (a,b)) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1,1), (2,1);
CREATE TABLE t2 (  a int(11) NOT NULL default '0',  b int(11) NOT NULL default '0',  PRIMARY KEY  (a,b)) ENGINE=MyISAM;
INSERT INTO t2 VALUES (1,2), (2,2);
CREATE TABLE t3 (  a int(11) NOT NULL default '0',  b int(11) NOT NULL default '0',  KEY a (a,b)) ENGINE=MRG_MyISAM UNION=(t1,t2);
select max(b) from t3 where a = 2;
max(b)
2
select max(b) from t1 where a = 2;
max(b)
1
drop table t3,t1,t2;
create table t1 (a int not null);
create table t2 (a int not null);
insert into t1 values (1);
insert into t2 values (2);
create temporary table t3 (a int not null) ENGINE=MERGE UNION=(t1,t2);
select * from t3;
a
1
2
create temporary table t4 (a int not null);
create temporary table t5 (a int not null);
insert into t4 values (1);
insert into t5 values (2);
create temporary table t6 (a int not null) ENGINE=MERGE UNION=(t4,t5);
select * from t6;
a
1
2
drop table t6, t3, t1, t2, t4, t5;
create temporary table t1 (a int not null);
create temporary table t2 (a int not null);
insert into t1 values (1);
insert into t2 values (2);
create table t3 (a int not null) ENGINE=MERGE UNION=(t1,t2);
select * from t3;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
drop table t3, t2, t1;
create table t1 (a int not null);
create temporary table t2 (a int not null);
insert into t1 values (1);
insert into t2 values (2);
create table t3 (a int not null) ENGINE=MERGE UNION=(t1,t2);
select * from t3;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
drop table t3;
create temporary table t3 (a int not null) ENGINE=MERGE UNION=(t1,t2);
select * from t3;
a
1
2
drop table t3, t2, t1;
# CREATE...SELECT is not implemented for MERGE tables.
CREATE TEMPORARY TABLE t1 (c1 INT NOT NULL);
CREATE TEMPORARY TABLE t2 (c1 INT NOT NULL);
CREATE TABLE t3 (c1 INT NOT NULL);
INSERT INTO t3 VALUES (3), (33);
LOCK TABLES t3 READ;
CREATE TEMPORARY TABLE t4 (c1 INT NOT NULL) ENGINE=MERGE UNION=(t1,t2)
INSERT_METHOD=LAST SELECT * FROM t3;
ERROR HY000: 'test.t4' is not of type 'BASE TABLE'
SELECT * FROM t4;
ERROR HY000: Table 't4' was not locked with LOCK TABLES
UNLOCK TABLES;
CREATE TEMPORARY TABLE t4 (c1 INT NOT NULL) ENGINE=MERGE UNION=(t1,t2)
INSERT_METHOD=LAST;
INSERT INTO t4 SELECT * FROM t3;
# Alter temporary MERGE table.
ALTER TABLE t4 UNION=(t1);
LOCK TABLES t4 WRITE;
# Alter temporary MERGE table under LOCk tables.
ALTER TABLE t4 UNION=(t1,t2);
UNLOCK TABLES;
# MERGE table and function.
CREATE FUNCTION f1 () RETURNS INT RETURN (SELECT max(c1) FROM t3);
SELECT * FROM t4 WHERE c1 < f1();
c1
3
DROP FUNCTION f1;
DROP TABLE t4, t3, t2, t1;
CREATE TABLE t1 (
fileset_id tinyint(3) unsigned NOT NULL default '0',
file_code varchar(32) NOT NULL default '',
fileset_root_id tinyint(3) unsigned NOT NULL default '0',
PRIMARY KEY  (fileset_id,file_code),
KEY files (fileset_id,fileset_root_id)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (2, '0000000111', 1), (2, '0000000112', 1), (2, '0000000113', 1),
(2, '0000000114', 1), (2, '0000000115', 1), (2, '0000000116', 1), (2, '0000000117', 1),
(2, '0000000118', 1), (2, '0000000119', 1), (2, '0000000120', 1);
CREATE TABLE t2 (
fileset_id tinyint(3) unsigned NOT NULL default '0',
file_code varchar(32) NOT NULL default '',
fileset_root_id tinyint(3) unsigned NOT NULL default '0',
PRIMARY KEY  (fileset_id,file_code),
KEY files (fileset_id,fileset_root_id)
) ENGINE=MRG_MyISAM UNION=(t1);
EXPLAIN SELECT * FROM t2 IGNORE INDEX (files) WHERE fileset_id = 2
AND file_code BETWEEN '0000000115' AND '0000000120' LIMIT 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	range	PRIMARY	PRIMARY	35	NULL	6	Using where
EXPLAIN SELECT * FROM t2 WHERE fileset_id = 2
AND file_code BETWEEN '0000000115' AND '0000000120' LIMIT 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	range	PRIMARY,files	PRIMARY	35	NULL	6	Using where
EXPLAIN SELECT * FROM t1 WHERE fileset_id = 2
AND file_code BETWEEN '0000000115' AND '0000000120' LIMIT 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	range	PRIMARY,files	PRIMARY	35	NULL	6	Using index condition
EXPLAIN SELECT * FROM t2 WHERE fileset_id = 2
AND file_code = '0000000115' LIMIT 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	const	PRIMARY,files	PRIMARY	35	const,const	1	
DROP TABLE t2, t1;
create table t1 (x int, y int, index xy(x, y));
create table t2 (x int, y int, index xy(x, y));
create table t3 (x int, y int, index xy(x, y)) engine=merge union=(t1,t2);
insert into t1 values(1, 2);
insert into t2 values(1, 3);
select * from t3 where x = 1 and y < 5 order by y;
x	y
1	2
1	3
select * from t3 where x = 1 and y < 5 order by y desc;
x	y
1	3
1	2
drop table t1,t2,t3;
create table t1 (a int);
create table t2 (a int);
insert into t1 values (0);
insert into t2 values (1);
create table t3 engine=merge union=(t1, t2) select * from t1;
ERROR HY000: 'test.t3' is not of type 'BASE TABLE'
create table t3 engine=merge union=(t1, t2) select * from t2;
ERROR HY000: 'test.t3' is not of type 'BASE TABLE'
create table t3 engine=merge union=(t1, t2) select (select max(a) from t2);
ERROR HY000: 'test.t3' is not of type 'BASE TABLE'
drop table t1, t2;
create table t1 (
a double(14,4),
b varchar(10),
index (a,b)
) engine=merge union=(t2,t3);
create table t2 (
a double(14,4),
b varchar(10),
index (a,b)
) engine=myisam;
create table t3 (
a double(14,4),
b varchar(10),
index (a,b)
) engine=myisam;
insert into t2 values ( null, '');
insert into t2 values ( 9999999999.999, '');
insert into t3 select * from t2;
select min(a), max(a) from t1;
min(a)	max(a)
9999999999.9990	9999999999.9990
flush tables;
select min(a), max(a) from t1;
min(a)	max(a)
9999999999.9990	9999999999.9990
drop table t1, t2, t3;
create table t1 (a int,b int,c int, index (a,b,c));
create table t2 (a int,b int,c int, index (a,b,c));
create table t3 (a int,b int,c int, index (a,b,c))
engine=merge union=(t1 ,t2);
insert into t1 (a,b,c) values (1,1,0),(1,2,0);
insert into t2 (a,b,c) values (1,1,1),(1,2,1);
explain select a,b,c from t3 force index (a) where a=1 order by a,b,c;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	ref	a	a	5	const	4	Using where; Using index
select a,b,c from t3 force index (a) where a=1 order by a,b,c;
a	b	c
1	1	0
1	1	1
1	2	0
1	2	1
explain select a,b,c from t3 force index (a) where a=1 order by a desc, b desc, c desc;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t3	ref	a	a	5	const	4	Using where; Using index
select a,b,c from t3 force index (a) where a=1 order by a desc, b desc, c desc;
a	b	c
1	2	1
1	2	0
1	1	1
1	1	0
show index from t3;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment	Ignored
t3	1	a	1	a	A	NULL	NULL	NULL	YES	BTREE			NO
t3	1	a	2	b	A	NULL	NULL	NULL	YES	BTREE			NO
t3	1	a	3	c	A	NULL	NULL	NULL	YES	BTREE			NO
drop table t1, t2, t3;
CREATE TABLE t1 ( a INT AUTO_INCREMENT PRIMARY KEY, b VARCHAR(10), UNIQUE (b) )
ENGINE=MyISAM;
CREATE TABLE t2 ( a INT AUTO_INCREMENT, b VARCHAR(10), INDEX (a), INDEX (b) )
ENGINE=MERGE UNION (t1) INSERT_METHOD=FIRST;
INSERT INTO t2 (b) VALUES (1) ON DUPLICATE KEY UPDATE b=2;
INSERT INTO t2 (b) VALUES (1) ON DUPLICATE KEY UPDATE b=3;
SELECT b FROM t2;
b
3
DROP TABLE t1, t2;
create table t1(a int);
create table t2(a int);
insert into t1 values (1);
insert into t2 values (2);
create table t3 (a int) engine=merge union=(t1, t2) insert_method=first;
select * from t3;
a
1
2
insert t2 select * from t2;
select * from t2;
a
2
2
insert t3 select * from t1;
select * from t3;
a
1
1
2
2
insert t1 select * from t3;
select * from t1;
a
1
1
1
1
2
2
select * from t2;
a
2
2
select * from t3;
a
1
1
1
1
2
2
2
2
check table t1, t2;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
test.t2	check	status	OK
drop table t1, t2, t3;
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES(2),(1);
CREATE TABLE t2(a INT, KEY(a)) ENGINE=MERGE UNION=(t1);
SELECT * FROM t2 WHERE a=2;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE t1, t2;
CREATE TABLE t1(a INT) ENGINE=MEMORY;
CREATE TABLE t2(a INT) ENGINE=MERGE UNION=(t1);
SELECT * FROM t2;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE t1, t2;
CREATE TABLE t2(a INT) ENGINE=MERGE UNION=(t3);
SELECT * FROM t2;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE t2;
CREATE TABLE t1(a INT, b TEXT);
CREATE TABLE tm1(a TEXT, b INT) ENGINE=MERGE UNION=(t1);
SELECT * FROM tm1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE t1, tm1;
CREATE TABLE t1(a SMALLINT, b SMALLINT);
CREATE TABLE tm1(a INT) ENGINE=MERGE UNION=(t1);
SELECT * FROM tm1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE t1, tm1;
CREATE TABLE t1(a SMALLINT, b SMALLINT, KEY(a, b));
CREATE TABLE tm1(a SMALLINT, b SMALLINT, KEY(a)) ENGINE=MERGE UNION=(t1);
SELECT * FROM tm1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE t1, tm1;
CREATE TABLE t1(a SMALLINT, b SMALLINT, KEY(b));
CREATE TABLE tm1(a SMALLINT, b SMALLINT, KEY(a)) ENGINE=MERGE UNION=(t1);
SELECT * FROM tm1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE t1, tm1;
CREATE TABLE t1(c1 VARCHAR(1));
CREATE TABLE m1 LIKE t1;
ALTER TABLE m1 ENGINE=MERGE UNION=(t1);
SELECT * FROM m1;
c1
DROP TABLE t1, m1;
CREATE TABLE t1(c1 VARCHAR(4), c2 TINYINT, c3 TINYINT, c4 TINYINT,
c5 TINYINT, c6 TINYINT, c7 TINYINT, c8 TINYINT, c9 TINYINT);
CREATE TABLE m1 LIKE t1;
ALTER TABLE m1 ENGINE=MERGE UNION=(t1);
SELECT * FROM m1;
c1	c2	c3	c4	c5	c6	c7	c8	c9
DROP TABLE t1, m1;
CREATE TABLE t1 (a VARCHAR(255) CHARACTER SET latin1 COLLATE latin1_german2_ci,
b INT, INDEX(a,b));
CREATE TABLE t2 LIKE t1;
CREATE TABLE t3 LIKE t1;
ALTER TABLE t3 ENGINE=MERGE UNION=(t1,t2);
INSERT INTO t1 VALUES ('ss',1);
INSERT INTO t2 VALUES ('ss',2),(0xDF,2);
SELECT COUNT(*) FROM t3 WHERE a=0xDF AND b=2;
COUNT(*)
2
DROP TABLE t1,t2,t3;
create table t1 (b bit(1));
create table t2 (b bit(1));
create table tm (b bit(1)) engine = merge union = (t1,t2);
select * from tm;
b
drop table tm, t1, t2;
create table t1 (a int) insert_method = last engine = merge;
insert into t1 values (1);
ERROR HY000: Table 't1' is read only
create table t2 (a int) engine = myisam;
alter table t1 union (t2);
insert into t1 values (1);
alter table t1 insert_method = no;
insert into t1 values (1);
ERROR HY000: Table 't1' is read only
drop table t2;
drop table t1;
CREATE TABLE tm1(a INT) ENGINE=MERGE UNION=(t1, t2);
SELECT * FROM tm1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
CHECK TABLE tm1;
Table	Op	Msg_type	Msg_text
test.tm1	check	Error	Table 'test.t1' is differently defined or of non-MyISAM type or doesn't exist
test.tm1	check	Error	Table 'test.t2' is differently defined or of non-MyISAM type or doesn't exist
test.tm1	check	Error	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.tm1	check	error	Corrupt
CREATE TABLE t1(a INT);
SELECT * FROM tm1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
CHECK TABLE tm1;
Table	Op	Msg_type	Msg_text
test.tm1	check	Error	Table 'test.t2' is differently defined or of non-MyISAM type or doesn't exist
test.tm1	check	Error	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.tm1	check	error	Corrupt
CREATE TABLE t2(a BLOB);
SELECT * FROM tm1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
CHECK TABLE tm1;
Table	Op	Msg_type	Msg_text
test.tm1	check	Error	Table 'test.t2' is differently defined or of non-MyISAM type or doesn't exist
test.tm1	check	Error	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.tm1	check	error	Corrupt
ALTER TABLE t2 MODIFY a INT;
SELECT * FROM tm1;
a
CHECK TABLE tm1;
Table	Op	Msg_type	Msg_text
test.tm1	check	status	OK
DROP TABLE tm1, t1, t2;
CREATE TABLE t1(c1 INT);
CREATE TABLE t2 (c1 INT) ENGINE=MERGE UNION=(t1) INSERT_METHOD=FIRST;
CREATE TABLE IF NOT EXISTS t1 SELECT * FROM t2;
Warnings:
Note	1050	Table 't1' already exists
DROP TABLE t1, t2;
CREATE TABLE t1 (id INT NOT NULL, ref INT NOT NULL, INDEX (id)) ENGINE=MyISAM;
CREATE TABLE t2 LIKE t1;
INSERT INTO t2 (id, ref) VALUES (1,3), (2,1), (3,2), (4,5), (4,4);
INSERT INTO t1 SELECT * FROM t2;
INSERT INTO t1 SELECT * FROM t2;
CREATE TABLE t3 (id INT NOT NULL, ref INT NOT NULL, INDEX (id)) ENGINE=MERGE
UNION(t1);
SELECT * FROM t3 AS a INNER JOIN t3 AS b USING (id) WHERE a.ref < b.ref;
id	ref	ref
4	4	5
4	4	5
4	4	5
4	4	5
SELECT * FROM t3;
id	ref
1	3
2	1
3	2
4	5
4	4
1	3
2	1
3	2
4	5
4	4
DELETE FROM a USING t3 AS a INNER JOIN t3 AS b USING (id) WHERE a.ref < b.ref;
SELECT * FROM t3;
id	ref
1	3
2	1
3	2
4	5
1	3
2	1
3	2
4	5
DROP TABLE t1, t2, t3;
CREATE TABLE t1(a INT);
CREATE TABLE m1(a INT) ENGINE=MERGE;
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TABLE `m1` (
  `a` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
DROP TABLE m1;
CREATE TABLE m1(a INT) ENGINE=MERGE UNION=();
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TABLE `m1` (
  `a` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
ALTER TABLE m1 UNION=(t1);
ALTER TABLE m1 UNION=();
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TABLE `m1` (
  `a` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
DROP TABLE t1, m1;
CREATE TABLE t1(a INT);
CREATE TABLE t2(a VARCHAR(10));
CREATE TABLE m1(a INT) ENGINE=MERGE UNION=(t1, t2);
CREATE TABLE m2(a INT) ENGINE=MERGE UNION=(t1);
SELECT * FROM t1;
a
SELECT * FROM m1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
SELECT * FROM m2;
a
DROP TABLE t1, t2, m1, m2;
End of 5.0 tests
create table t1 (c1 int, index(c1));
create table t2 (c1 int, index(c1)) engine=merge union=(t1);
insert into t1 values (1);
flush tables;
select * from t2;
c1
1
flush tables;
truncate table t1;
insert into t1 values (1);
flush tables;
select * from t2;
c1
1
truncate table t1;
insert into t1 values (1);
drop table t1,t2;
#
# Extra tests for TRUNCATE.
#
# Truncate MERGE table.
CREATE TABLE t1 (c1 INT, INDEX(c1));
CREATE TABLE t2 (c1 INT, INDEX(c1));
CREATE TABLE t3 (c1 INT, INDEX(c1)) ENGINE=MRG_MYISAM UNION=(t1,t2);
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
SELECT * FROM t3;
c1
1
2
TRUNCATE TABLE t3;
SELECT * FROM t3;
c1
#
# Truncate child table.
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
TRUNCATE TABLE t1;
SELECT * FROM t3;
c1
2
#
# Truncate MERGE table under locked tables.
LOCK TABLE t1 WRITE, t2 WRITE, t3 WRITE;
INSERT INTO t1 VALUES (1);
TRUNCATE TABLE t3;
SELECT * FROM t3;
c1
UNLOCK TABLES;
SELECT * FROM t1;
c1
SELECT * FROM t2;
c1
#
# Truncate child table under locked tables.
LOCK TABLE t1 WRITE, t2 WRITE, t3 WRITE;
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
TRUNCATE TABLE t1;
SELECT * FROM t3;
c1
2
UNLOCK TABLES;
DROP TABLE t1, t2, t3;
#
# Truncate temporary MERGE table.
CREATE TEMPORARY TABLE t1 (c1 INT, INDEX(c1));
CREATE TEMPORARY TABLE t2 (c1 INT, INDEX(c1));
CREATE TEMPORARY TABLE t3 (c1 INT, INDEX(c1)) ENGINE=MRG_MYISAM UNION=(t1,t2);
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
SELECT * FROM t3;
c1
1
2
TRUNCATE TABLE t3;
SELECT * FROM t3;
c1
#
# Truncate temporary child table.
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
TRUNCATE TABLE t1;
SELECT * FROM t3;
c1
2
#
# Truncate temporary MERGE table under locked tables.
INSERT INTO t1 VALUES (1);
CREATE TABLE t4 (c1 INT, INDEX(c1));
LOCK TABLE t4 WRITE;
TRUNCATE TABLE t3;
SELECT * FROM t3;
c1
SELECT * FROM t1;
c1
SELECT * FROM t2;
c1
#
# Truncate temporary child table under locked tables.
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
TRUNCATE TABLE t1;
SELECT * FROM t3;
c1
2
SELECT * FROM t1;
c1
SELECT * FROM t2;
c1
2
UNLOCK TABLES;
DROP TABLE t1, t2, t3, t4;
connect  con1,localhost,root,,;
connect  con2,localhost,root,,;
connection default;
CREATE TABLE t1 (c1 INT) ENGINE= MyISAM;
CREATE TABLE t2 (c1 INT) ENGINE= MRG_MYISAM UNION= (t1) INSERT_METHOD= LAST;
REPAIR TABLE t1;
connection con1;
INSERT INTO t2 VALUES (1);
connection default;
Table	Op	Msg_type	Msg_text
test.t1	repair	status	OK
DROP TABLE t1, t2;
CREATE TABLE t1 (c1 INT) ENGINE= MyISAM;
CREATE TABLE t2 (c1 INT) ENGINE= MRG_MYISAM UNION= (t1) INSERT_METHOD= LAST;
LOCK TABLE t1 WRITE;
connection con1;
INSERT INTO t2 VALUES (1);
connection default;
REPAIR TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	repair	status	OK
UNLOCK TABLES;
connection con1;
connection default;
DROP TABLE t1, t2;
CREATE TABLE t1 (c1 INT) ENGINE= MyISAM;
LOCK TABLE t1 WRITE;
connection con1;
INSERT INTO t1 VALUES (1);
connection default;
FLUSH TABLES;
FLUSH TABLES;
SELECT * FROM t1;
c1
UNLOCK TABLES;
connection con1;
connection default;
DROP TABLE t1;
disconnect con1;
disconnect con2;
#
# Extra tests for Bug#26379 - Combination of FLUSH TABLE and
#                             REPAIR TABLE corrupts a MERGE table
#
# CREATE ... SELECT is disabled for MERGE tables.
#
CREATE TABLE t1(c1 INT);
INSERT INTO t1 VALUES (1);
CREATE TABLE t2 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1) INSERT_METHOD=LAST;
CREATE TABLE t3 ENGINE=MRG_MYISAM INSERT_METHOD=LAST SELECT * FROM t2;
ERROR HY000: Table 't3' is read only
SHOW CREATE TABLE t3;
ERROR 42S02: Table 'test.t3' doesn't exist
CREATE TABLE t3 ENGINE=MRG_MYISAM UNION=(t1) INSERT_METHOD=LAST
SELECT * FROM t2;
ERROR HY000: 'test.t3' is not of type 'BASE TABLE'
SHOW CREATE TABLE t3;
ERROR 42S02: Table 'test.t3' doesn't exist
DROP TABLE t1, t2;
#
# Bug#37371 "CREATE TABLE LIKE merge loses UNION parameter"
# Demonstrate that this is no longer the case.
#
# 1. Create like.
CREATE TABLE t1 (c1 INT);
CREATE TABLE t2 (c1 INT);
CREATE TABLE t3 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1,t2)
INSERT_METHOD=LAST;
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
INSERT INTO t3 VALUES (3);
CREATE TABLE t4 LIKE t3;
SHOW CREATE TABLE t4;
Table	Create Table
t4	CREATE TABLE `t4` (
  `c1` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
INSERT INTO t4 VALUES (4);
DROP TABLE t4;
#
# 1. Create like with locked tables.
LOCK TABLES t3 WRITE, t2 WRITE, t1 WRITE;
CREATE TABLE t4 LIKE t3;
ERROR HY000: Table 't4' was not locked with LOCK TABLES
SHOW CREATE TABLE t4;
ERROR HY000: Table 't4' was not locked with LOCK TABLES
INSERT INTO t4 VALUES (4);
ERROR HY000: Table 't4' was not locked with LOCK TABLES
# Temporary tables can be created in spite of LOCK TABLES.
# If the temporary MERGE table uses the locked children only,
# it can even be used.
CREATE TEMPORARY TABLE t4 LIKE t3;
SHOW CREATE TABLE t4;
Table	Create Table
t4	CREATE TEMPORARY TABLE `t4` (
  `c1` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
INSERT INTO t4 VALUES (4);
UNLOCK TABLES;
INSERT INTO t4 VALUES (4);
DROP TABLE t4;
#
# Rename child.
#
# 1. Normal rename of non-MERGE table.
CREATE TABLE t4 (c1 INT);
INSERT INTO t4 VALUES (4);
SELECT * FROM t4 ORDER BY c1;
c1
4
RENAME TABLE t4 TO t5;
SELECT * FROM t5 ORDER BY c1;
c1
4
RENAME TABLE t5 TO t4;
SELECT * FROM t4 ORDER BY c1;
c1
4
DROP TABLE t4;
#
# 2. Normal rename.
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
4
4
4
RENAME TABLE t2 TO t5;
SELECT * FROM t3 ORDER BY c1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
RENAME TABLE t5 TO t2;
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
4
4
4
#
# 3. Normal rename with locked tables.
LOCK TABLES t1 WRITE, t2 WRITE, t3 WRITE;
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
4
4
4
RENAME TABLE t2 TO t5;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
4
4
4
RENAME TABLE t5 TO t2;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
4
4
4
UNLOCK TABLES;
#
# 4. Alter table rename.
ALTER TABLE t2 RENAME TO t5;
SELECT * FROM t3 ORDER BY c1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
ALTER TABLE t5 RENAME TO t2;
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
4
4
4
#
# 5. Alter table rename with locked tables.
LOCK TABLES t1 WRITE, t2 WRITE, t3 WRITE;
ALTER TABLE t2 RENAME TO t5;
SELECT * FROM t3 ORDER BY c1;
ERROR HY000: Table 't2' was not locked with LOCK TABLES
ALTER TABLE t5 RENAME TO t2;
ERROR HY000: Table 't5' was not locked with LOCK TABLES
UNLOCK TABLES;
ALTER TABLE t5 RENAME TO t2;
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
4
4
4
#
# Rename parent.
#
# 1. Normal rename with locked tables.
LOCK TABLES t1 WRITE, t2 WRITE, t3 WRITE;
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
4
4
4
RENAME TABLE t3 TO t5;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
4
4
4
RENAME TABLE t5 TO t3;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
4
4
4
#
# 5. Alter table rename with locked tables.
ALTER TABLE t3 RENAME TO t5;
SELECT * FROM t5 ORDER BY c1;
ERROR HY000: Table 't5' was not locked with LOCK TABLES
ALTER TABLE t5 RENAME TO t3;
ERROR HY000: Table 't5' was not locked with LOCK TABLES
UNLOCK TABLES;
ALTER TABLE t5 RENAME TO t3;
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
4
4
4
DROP TABLE t1, t2, t3;
#
# Drop locked tables.
#
# 1. Drop parent.
CREATE TABLE t1 (c1 INT, INDEX(c1));
CREATE TABLE t2 (c1 INT, INDEX(c1)) ENGINE=MRG_MYISAM UNION=(t1)
INSERT_METHOD=LAST;
LOCK TABLES t1 WRITE, t2 WRITE;
INSERT INTO t1 VALUES (1);
DROP TABLE t2;
SELECT * FROM t2;
ERROR HY000: Table 't2' was not locked with LOCK TABLES
SELECT * FROM t1;
c1
1
UNLOCK TABLES;
# 2. Drop child.
CREATE TABLE t2 (c1 INT, INDEX(c1)) ENGINE=MRG_MYISAM UNION=(t1)
INSERT_METHOD=LAST;
LOCK TABLES t1 WRITE, t2 WRITE;
INSERT INTO t1 VALUES (1);
DROP TABLE t1;
SELECT * FROM t2;
ERROR HY000: Table 't1' was not locked with LOCK TABLES
SELECT * FROM t1;
ERROR HY000: Table 't1' was not locked with LOCK TABLES
UNLOCK TABLES;
DROP TABLE t2;
#
# ALTER TABLE. Change child list.
#
CREATE TABLE t1 (c1 INT, INDEX(c1));
CREATE TABLE t2 (c1 INT, INDEX(c1));
CREATE TABLE t3 (c1 INT, INDEX(c1));
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
INSERT INTO t3 VALUES (3);
CREATE TABLE t4 (c1 INT, INDEX(c1)) ENGINE=MRG_MYISAM UNION=(t3,t2)
INSERT_METHOD=LAST;
# Shrink child list.
ALTER TABLE t4 UNION=(t3);
SHOW CREATE TABLE t4;
Table	Create Table
t4	CREATE TABLE `t4` (
  `c1` int(11) DEFAULT NULL,
  KEY `c1` (`c1`)
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t3`)
SELECT * FROM t4 ORDER BY c1;
c1
3
# Extend child list.
ALTER TABLE t4 UNION=(t3,t2);
SHOW CREATE TABLE t4;
Table	Create Table
t4	CREATE TABLE `t4` (
  `c1` int(11) DEFAULT NULL,
  KEY `c1` (`c1`)
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t3`,`t2`)
SELECT * FROM t4 ORDER BY c1;
c1
2
3
#
# ALTER TABLE under LOCK TABLES. Change child list.
#
LOCK TABLES t4 WRITE, t3 WRITE, t2 WRITE;
# Shrink child list.
ALTER TABLE t4 UNION=(t3);
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
# Extend child list within locked tables.
ALTER TABLE t4 UNION=(t3,t2);
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
# Extend child list beyond locked tables.
ALTER TABLE t4 UNION=(t3,t2,t1);
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
SHOW CREATE TABLE t4;
Table	Create Table
t4	CREATE TABLE `t4` (
  `c1` int(11) DEFAULT NULL,
  KEY `c1` (`c1`)
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t3`,`t2`)
SELECT * FROM t4 ORDER BY c1;
c1
2
3
UNLOCK TABLES;
DROP TABLE t4;
#
# ALTER TABLE under LOCK TABLES. Grave change, table re-creation.
#
CREATE TABLE t4 (c1 INT, INDEX(c1)) ENGINE=MRG_MYISAM UNION=(t1,t2,t3)
INSERT_METHOD=LAST;
# Lock parent first and then children.
LOCK TABLES t4 WRITE, t3 WRITE, t2 WRITE, t1 WRITE;
ALTER TABLE t4 DROP INDEX c1, ADD UNIQUE INDEX (c1);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
ALTER TABLE t2 DROP INDEX c1, ADD UNIQUE INDEX (c1);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
UNLOCK TABLES;
# Lock children first and then parent.
LOCK TABLES t1 WRITE, t2 WRITE, t3 WRITE, t4 WRITE;
ALTER TABLE t4 DROP INDEX c1, ADD UNIQUE INDEX (c1);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
ALTER TABLE t2 DROP INDEX c1, ADD UNIQUE INDEX (c1);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
UNLOCK TABLES;
# Lock parent between children.
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
ALTER TABLE t4 DROP INDEX c1, ADD UNIQUE INDEX (c1);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
ALTER TABLE t2 DROP INDEX c1, ADD UNIQUE INDEX (c1);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
UNLOCK TABLES;
DROP TABLE t1, t2, t3, t4;
#
# ALTER TABLE under LOCK TABLES. Simple change, no re-creation.
#
CREATE TABLE t1 (c1 INT);
CREATE TABLE t2 (c1 INT);
CREATE TABLE t3 (c1 INT);
CREATE TABLE t4 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1,t2,t3)
INSERT_METHOD=LAST;
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
INSERT INTO t3 VALUES (3);
# Lock parent first and then children.
LOCK TABLES t4 WRITE, t3 WRITE, t2 WRITE, t1 WRITE;
ALTER TABLE t4 ALTER COLUMN c1 SET DEFAULT 44;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
ALTER TABLE t2 ALTER COLUMN c1 SET DEFAULT 22;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
UNLOCK TABLES;
# Lock children first and then parent.
LOCK TABLES t1 WRITE, t2 WRITE, t3 WRITE, t4 WRITE;
ALTER TABLE t4 ALTER COLUMN c1 SET DEFAULT 44;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
ALTER TABLE t2 ALTER COLUMN c1 SET DEFAULT 22;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
UNLOCK TABLES;
# Lock parent between children.
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
ALTER TABLE t4 ALTER COLUMN c1 SET DEFAULT 44;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
ALTER TABLE t2 ALTER COLUMN c1 SET DEFAULT 22;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
UNLOCK TABLES;
#
# FLUSH TABLE under LOCK TABLES.
#
# Lock parent first and then children.
LOCK TABLES t4 WRITE, t3 WRITE, t2 WRITE, t1 WRITE;
FLUSH TABLE t4;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
FLUSH TABLE t2;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
FLUSH TABLES;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
UNLOCK TABLES;
# Lock children first and then parent.
LOCK TABLES t1 WRITE, t2 WRITE, t3 WRITE, t4 WRITE;
FLUSH TABLE t4;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
FLUSH TABLE t2;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
FLUSH TABLES;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
UNLOCK TABLES;
# Lock parent between children.
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
FLUSH TABLE t4;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
FLUSH TABLE t2;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
FLUSH TABLES;
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
UNLOCK TABLES;
#
# Triggers
#
# Trigger on parent
DELETE FROM t4 WHERE c1 = 4;
CREATE TRIGGER t4_ai1 AFTER INSERT ON t4 FOR EACH ROW SET @a=1;
SET @a=0;
INSERT INTO t4 VALUES (4);
SELECT @a;
@a
1
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
DROP TRIGGER t4_ai1;
CHECK TABLE t3;
Table	Op	Msg_type	Msg_text
test.t3	check	status	OK
# Trigger on parent under LOCK TABLES
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
CREATE TRIGGER t4_ai2 AFTER INSERT ON t4 FOR EACH ROW SET @a=1;
SET @a=0;
INSERT INTO t4 VALUES (4);
SELECT @a;
@a
1
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
4
DROP TRIGGER t4_ai2;
UNLOCK TABLES;
CHECK TABLE t3;
Table	Op	Msg_type	Msg_text
test.t3	check	status	OK
#
# Trigger on child
DELETE FROM t4 WHERE c1 = 4;
CREATE TRIGGER t3_ai3 AFTER INSERT ON t3 FOR EACH ROW SET @a=1;
SET @a=0;
INSERT INTO t4 VALUES (4);
SELECT @a;
@a
0
INSERT INTO t3 VALUES (33);
SELECT @a;
@a
1
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
33
DROP TRIGGER t3_ai3;
CHECK TABLE t3;
Table	Op	Msg_type	Msg_text
test.t3	check	status	OK
# Trigger on child under LOCK TABLES
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
CREATE TRIGGER t3_ai4 AFTER INSERT ON t3 FOR EACH ROW SET @a=1;
SET @a=0;
INSERT INTO t4 VALUES (4);
SELECT @a;
@a
0
INSERT INTO t3 VALUES (33);
SELECT @a;
@a
1
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
4
33
33
DELETE FROM t4 WHERE c1 = 33;
DROP TRIGGER t3_ai4;
UNLOCK TABLES;
CHECK TABLE t3;
Table	Op	Msg_type	Msg_text
test.t3	check	status	OK
#
# Trigger with table use on child
DELETE FROM t4 WHERE c1 = 4;
CREATE TRIGGER t3_ai5 AFTER INSERT ON t3 FOR EACH ROW INSERT INTO t2 VALUES(22);
SELECT COUNT(*) FROM t2;
COUNT(*)
1
INSERT INTO t4 VALUES (4);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
INSERT INTO t3 VALUES (33);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
22
33
DELETE FROM t4 WHERE c1 = 22;
DELETE FROM t4 WHERE c1 = 33;
DROP TRIGGER t3_ai5;
UNLOCK TABLES;
CHECK TABLE t2,t3;
Table	Op	Msg_type	Msg_text
test.t2	check	status	OK
test.t3	check	status	OK
# Trigger with table use on child under LOCK TABLES
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
CREATE TRIGGER t3_ai6 AFTER INSERT ON t3 FOR EACH ROW INSERT INTO t2 VALUES(22);
INSERT INTO t4 VALUES (4);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
4
INSERT INTO t3 VALUES (33);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
4
22
33
DROP TRIGGER t3_ai6;
UNLOCK TABLES;
check table t2,t3,t4;
Table	Op	Msg_type	Msg_text
test.t2	check	status	OK
test.t3	check	status	OK
test.t4	check	status	OK
DELETE FROM t4 WHERE c1 = 22;
DELETE FROM t4 WHERE c1 = 33;
# Trigger with table use on child under different LOCK TABLES
DELETE FROM t4 WHERE c1 = 4;
LOCK TABLES t4 WRITE,t3 WRITE, t2 WRITE, t1 WRITE;
CREATE TRIGGER t3_ai7 AFTER INSERT ON t3 FOR EACH ROW INSERT INTO t2 VALUES(22);
INSERT INTO t4 VALUES (4);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
INSERT INTO t3 VALUES (33);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
22
33
DROP TRIGGER t3_ai7;
UNLOCK TABLES;
check table t2,t3,t4;
Table	Op	Msg_type	Msg_text
test.t2	check	status	OK
test.t3	check	status	OK
test.t4	check	status	OK
DELETE FROM t4 WHERE c1 = 22;
DELETE FROM t4 WHERE c1 = 33;
#
# Repair
#
REPAIR TABLE t4;
Table	Op	Msg_type	Msg_text
test.t4	repair	note	The storage engine for the table doesn't support repair
REPAIR TABLE t2;
Table	Op	Msg_type	Msg_text
test.t2	repair	status	OK
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
REPAIR TABLE t4;
Table	Op	Msg_type	Msg_text
test.t4	repair	note	The storage engine for the table doesn't support repair
REPAIR TABLE t2;
Table	Op	Msg_type	Msg_text
test.t2	repair	status	OK
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
UNLOCK TABLES;
#
# Optimize
#
OPTIMIZE TABLE t4;
Table	Op	Msg_type	Msg_text
test.t4	optimize	note	The storage engine for the table doesn't support optimize
OPTIMIZE TABLE t2;
Table	Op	Msg_type	Msg_text
test.t2	optimize	status	OK
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
OPTIMIZE TABLE t4;
Table	Op	Msg_type	Msg_text
test.t4	optimize	note	The storage engine for the table doesn't support optimize
OPTIMIZE TABLE t2;
Table	Op	Msg_type	Msg_text
test.t2	optimize	status	Table is already up to date
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
UNLOCK TABLES;
#
# Checksum
#
CHECKSUM TABLE t4;
Table	Checksum
test.t4	149057747
CHECKSUM TABLE t2;
Table	Checksum
test.t2	3700403066
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
CHECKSUM TABLE t4;
Table	Checksum
test.t4	149057747
CHECKSUM TABLE t2;
Table	Checksum
test.t2	3700403066
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
UNLOCK TABLES;
#
# Insert delayed
#
INSERT DELAYED INTO t4 VALUES(44);
DELETE FROM t4 WHERE c1 = 44;
INSERT DELAYED INTO t3 VALUES(33);
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
33
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
INSERT DELAYED INTO t4 VALUES(444);
Got one of the listed errors
INSERT DELAYED INTO t3 VALUES(333);
Got one of the listed errors
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
33
UNLOCK TABLES;
DROP TABLE t1, t2, t3, t4;
#
# Recursive inclusion of merge tables in their union clauses.
#
CREATE TABLE t1 (c1 INT, INDEX(c1));
CREATE TABLE t2 (c1 INT, INDEX(c1)) ENGINE=MRG_MYISAM UNION=(t1)
INSERT_METHOD=LAST;
CREATE TABLE t3 (c1 INT, INDEX(c1)) ENGINE=MRG_MYISAM UNION=(t2,t1)
INSERT_METHOD=LAST;
ALTER TABLE t2 UNION=(t3,t1);
SELECT * FROM t2;
ERROR HY000: Table 't3' is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE t1, t2, t3;
CREATE TABLE t1 (c1 INT) ENGINE= MyISAM;
CREATE TABLE t2 (c1 INT) ENGINE= MyISAM;
CREATE TABLE t3 (c1 INT) ENGINE= MRG_MYISAM UNION= (t1, t2);
INSERT INTO t1 VALUES (1);
INSERT INTO t2 VALUES (2);
SELECT * FROM t3;
c1
1
2
TRUNCATE TABLE t1;
SELECT * FROM t3;
c1
2
DROP TABLE t1, t2, t3;
CREATE TABLE t1 (id INTEGER, grp TINYINT, id_rev INTEGER);
SET @rnd_max= 2147483647;
set @@read_buffer_size=2*1024*1024;
CREATE TABLE t2 SELECT * FROM t1;
INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1;
INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
INSERT INTO t2 (id, grp, id_rev) SELECT id, grp, id_rev FROM t1;
INSERT INTO t1 (id, grp, id_rev) SELECT id, grp, id_rev FROM t2;
CREATE TABLE t3 (id INTEGER, grp TINYINT, id_rev INTEGER)
ENGINE= MRG_MYISAM UNION= (t1, t2);
SELECT COUNT(*) FROM t1;
COUNT(*)
130
SELECT COUNT(*) FROM t2;
COUNT(*)
80
SELECT COUNT(*) FROM t3;
COUNT(*)
210
connect  con1,localhost,root,,;
SELECT COUNT(DISTINCT a1.id) FROM t3 AS a1, t3 AS a2
WHERE a1.id = a2.id GROUP BY a2.grp;
connection default;
TRUNCATE TABLE t1;
connection con1;
disconnect con1;
connection default;
SELECT COUNT(*) FROM t1;
COUNT(*)
0
SELECT COUNT(*) FROM t2;
COUNT(*)
80
SELECT COUNT(*) FROM t3;
COUNT(*)
80
DROP TABLE t1, t2, t3;
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TABLE t2 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1) INSERT_METHOD=LAST;
INSERT INTO t2 VALUES (1);
SELECT * FROM t2;
c1
1
LOCK TABLES t2 WRITE, t1 WRITE;
FLUSH TABLES;
REPAIR TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	repair	status	OK
CHECK TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
REPAIR TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	repair	status	OK
UNLOCK TABLES;
CHECK TABLE t1 EXTENDED;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
LOCK TABLES t2 WRITE, t1 WRITE;
REPAIR TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	repair	status	OK
CHECK TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
REPAIR TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	repair	status	OK
UNLOCK TABLES;
CHECK TABLE t1 EXTENDED;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
DROP TABLE t1, t2;
CREATE TABLE t1 ( a INT ) ENGINE=MyISAM;
CREATE TABLE m1 ( a INT ) ENGINE=MRG_MYISAM UNION=(t1);
LOCK TABLES t1 WRITE, m1 WRITE;
FLUSH TABLE t1;
UNLOCK TABLES;
DROP TABLE m1, t1;
CREATE TABLE t1 ( a INT ) ENGINE=MyISAM;
CREATE TABLE m1 ( a INT ) ENGINE=MRG_MYISAM UNION=(t1);
LOCK TABLES m1 WRITE, t1 WRITE;
FLUSH TABLE t1;
UNLOCK TABLES;
DROP TABLE m1, t1;
CREATE TABLE t1 (c1 INT, c2 INT) ENGINE= MyISAM;
CREATE TABLE t2 (c1 INT, c2 INT) ENGINE= MyISAM;
CREATE TABLE t3 (c1 INT, c2 INT) ENGINE= MRG_MYISAM UNION(t1, t2);
INSERT INTO t1 VALUES (1, 1);
INSERT INTO t2 VALUES (2, 2);
SELECT * FROM t3;
c1	c2
1	1
2	2
ALTER TABLE t1 ENGINE= MEMORY;
INSERT INTO t1 VALUES (0, 0);
SELECT * FROM t3;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE t1, t2, t3;
CREATE TABLE t1 (c1 INT, KEY(c1));
CREATE TABLE t2 (c1 INT, KEY(c1)) ENGINE=MRG_MYISAM UNION=(t1)
INSERT_METHOD=FIRST;
LOCK TABLE t1 WRITE, t2 WRITE;
FLUSH TABLES t2, t1;
OPTIMIZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	optimize	status	Table is already up to date
FLUSH TABLES t1;
UNLOCK TABLES;
FLUSH TABLES;
INSERT INTO t1 VALUES (1);
LOCK TABLE t1 WRITE, t2 WRITE;
FLUSH TABLES t2, t1;
OPTIMIZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	optimize	status	OK
FLUSH TABLES t1;
UNLOCK TABLES;
DROP TABLE t1, t2;
CREATE TABLE t1 (ID INT) ENGINE=MYISAM;
CREATE TABLE m1 (ID INT) ENGINE=MRG_MYISAM UNION=(t1) INSERT_METHOD=FIRST;
INSERT INTO t1 VALUES ();
INSERT INTO m1 VALUES ();
LOCK TABLE t1 WRITE, m1 WRITE;
FLUSH TABLES m1, t1;
OPTIMIZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	optimize	status	OK
FLUSH TABLES m1, t1;
UNLOCK TABLES;
DROP TABLE t1, m1;
CREATE TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1) INSERT_METHOD=FIRST;
SELECT table_schema, table_name, table_type, engine, version, row_format, table_comment FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = 'test' and TABLE_NAME='tm1';
table_schema	table_name	table_type	engine	version	row_format	table_comment
test	tm1	BASE TABLE	NULL	NULL	NULL	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
Warnings:
Warning	1168	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE tm1;
CREATE TABLE t1(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2)) ENGINE=MYISAM;
CREATE TABLE t2(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2)) ENGINE=MYISAM;
CREATE TABLE t3(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2)) ENGINE=MYISAM;
CREATE TABLE t4(C1 INT, C2 INT, KEY C1(C1), KEY C2(C2))
ENGINE=MRG_MYISAM UNION=(t1, t2, t3);
INSERT INTO t1 VALUES (1,1), (1,2),(1,3), (1,4);
INSERT INTO t2 VALUES (2,1), (2,2),(2,3), (2,4);
INSERT INTO t3 VALUES (3,1), (3,2),(3,3), (3,4);
EXPLAIN SELECT COUNT(*) FROM t1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
EXPLAIN SELECT COUNT(*) FROM t4;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Select tables optimized away
DROP TABLE t1, t2, t3, t4;
CREATE TABLE t1(a INT, KEY(a));
INSERT INTO t1 VALUES(0),(1),(2),(3),(4);
ANALYZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	OK
CREATE TABLE m1(a INT, KEY(a)) ENGINE=MERGE UNION=(t1);
SELECT CARDINALITY FROM INFORMATION_SCHEMA.STATISTICS WHERE TABLE_SCHEMA='test' AND TABLE_NAME='m1';
CARDINALITY
5
SELECT CARDINALITY FROM INFORMATION_SCHEMA.STATISTICS WHERE TABLE_SCHEMA='test' AND TABLE_NAME='m1';
CARDINALITY
5
SELECT CARDINALITY FROM INFORMATION_SCHEMA.STATISTICS WHERE TABLE_SCHEMA='test' AND TABLE_NAME='m1';
CARDINALITY
5
SELECT CARDINALITY FROM INFORMATION_SCHEMA.STATISTICS WHERE TABLE_SCHEMA='test' AND TABLE_NAME='m1';
CARDINALITY
5
DROP TABLE t1, m1;
#
# Bug #40675 MySQL 5.1 crash with index merge algorithm and Merge tables
#
# create MYISAM table t1 and insert values into it
CREATE TABLE t1(a INT);
INSERT INTO t1 VALUES(1);
# create MYISAM table t2 and insert values into it
CREATE TABLE t2(a INT, b INT, dummy CHAR(16) DEFAULT '', KEY(a), KEY(b));
INSERT INTO t2(a,b) VALUES
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),(0,0),
(1,2);
# Create the merge table t3
CREATE TABLE t3(a INT, b INT, dummy CHAR(16) DEFAULT '', KEY(a), KEY(b))
ENGINE=MERGE UNION=(t2) INSERT_METHOD=FIRST;
# Lock tables t1 and t3 for write
LOCK TABLES t1 WRITE, t3 WRITE;
# Insert values into the merge table t3
INSERT INTO t3(a,b) VALUES(1,2);
# select from the join of t2 and t3 (The merge table)
SELECT t3.a FROM t1,t3 WHERE t3.b=2 AND t3.a=1;
a
1
1
# Unlock the tables
UNLOCK TABLES;
# drop the created tables
DROP TABLE t1, t2, t3;
# insert duplicate value in child table while merge table doesn't have key
create table t1 (
col1 int(10),
primary key (col1)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;
CREATE TABLE m1 (
col1 int(10) NOT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 INSERT_METHOD=LAST UNION=(t1);
insert into m1 (col1) values (1);
insert into m1 (col1) values (1);
ERROR 23000: Can't write; duplicate key in table 'm1'
drop table m1, t1;
#
# Bug#45800 crash when replacing into a merge table and there is a duplicate
#
# Replace duplicate value in child table when merge table doesn't have key
CREATE TABLE t1 (c1 INT PRIMARY KEY) ENGINE=MyISAM;
CREATE TABLE m1 (c1 INT NOT NULL) ENGINE=MRG_MyISAM INSERT_METHOD=LAST UNION=(t1);
INSERT INTO m1  VALUES (666);
SELECT * FROM m1;
c1
666
# insert the duplicate value into the merge table
REPLACE INTO m1 VALUES (666);
SELECT * FROM m1;
c1
666
DROP TABLE m1, t1;
# Insert... on duplicate key update (with duplicate values in the table)
CREATE TABLE t1 (c1 INT PRIMARY KEY) ENGINE=MyISAM;
CREATE TABLE m1 (c1 INT NOT NULL) ENGINE=MRG_MyISAM INSERT_METHOD=LAST UNION=(t1);
INSERT INTO m1  VALUES (666);
SELECT * FROM m1;
c1
666
# insert the duplicate value into the merge table
INSERT INTO m1 VALUES (666) ON DUPLICATE KEY UPDATE c1=c1+1;
SELECT * FROM m1;
c1
667
DROP TABLE m1, t1;
# Insert duplicate value on MERGE table, where, MERGE has a key but MyISAM has more keys
CREATE TABLE t1 (c1 INT, c2 INT, UNIQUE (c1), UNIQUE (c2));
CREATE TABLE m1 (c1 INT, c2 INT, UNIQUE (c1)) ENGINE=MRG_MyISAM INSERT_METHOD=LAST UNION=(t1);
INSERT INTO m1 VALUES (1,2);
# insert the duplicate value into the merge table
INSERT INTO m1 VALUES (3,2);
ERROR 23000: Can't write; duplicate key in table 'm1'
DROP TABLE m1,t1;
# Try to define MERGE and MyISAM with keys on different columns
CREATE TABLE t1 (c1 INT, c2 INT, UNIQUE (c1));
CREATE TABLE m1 (c1 INT, c2 INT, UNIQUE (c2)) ENGINE=MRG_MyISAM INSERT_METHOD=LAST UNION=(t1);
# Try accessing the merge table for inserts (error occurs)
INSERT INTO m1 VALUES (1,2);
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
INSERT INTO m1 VALUES (1,4);
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE m1,t1;
CREATE TABLE t1 (
col1 INT(10)
) ENGINE=MyISAM  DEFAULT CHARSET=latin1;
CREATE VIEW v1 as SELECT * FROM t1;
CREATE TABLE m1 (
col1 INT(10)
)ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 INSERT_METHOD=LAST UNION=(v1);
#Select should detect that the child table is a view and fail.
SELECT * FROM m1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP VIEW v1;
DROP TABLE m1, t1;
#
# Bug #45796: invalid memory reads and writes when altering merge and 
#             base tables
#
CREATE TABLE t1(c1 INT) ENGINE=MyISAM;
CREATE TABLE m1(c1 INT) ENGINE=MERGE UNION=(t1);
ALTER TABLE m1 ADD INDEX idx_c1(c1);
SELECT * FROM m1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
ALTER TABLE t1 ADD INDEX idx_c1(c1);
SELECT * FROM m1;
c1
DROP TABLE m1;
DROP TABLE t1;
#
# Bug45781 infinite hang/crash in "opening tables" after handler tries to
#          open merge table
#
CREATE TABLE t1(a int)engine=myisam;
CREATE TABLE t2(a int)engine=myisam;
CREATE TABLE t3(a int)engine=myisam;
CREATE TABLE t4(a int)engine=myisam;
CREATE TABLE t5(a int)engine=myisam;
CREATE TABLE t6(a int)engine=myisam;
CREATE TABLE t7(a int)engine=myisam;
CREATE TABLE m1(a int)engine=merge union=(t1,t2,t3,t4,t5,t6,t7);
SELECT 1 FROM m1;
1
HANDLER m1 OPEN;
ERROR HY000: Storage engine MRG_MyISAM of the table `test`.`m1` doesn't have this option
DROP TABLE m1,t1,t2,t3,t4,t5,t6,t7;
SELECT 1 FROM m1;
ERROR 42S02: Table 'test.m1' doesn't exist
#
# Bug #46614: Assertion in show_create_trigger()
#
CREATE TABLE t1(a int);
CREATE TABLE t2(a int);
CREATE TABLE t3(a int) ENGINE = MERGE UNION(t1, t2);
CREATE TRIGGER tr1 AFTER INSERT ON t3 FOR EACH ROW CALL foo();
SHOW CREATE TRIGGER tr1;
Trigger	sql_mode	SQL Original Statement	character_set_client	collation_connection	Database Collation	Created
tr1	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CREATE DEFINER=`root`@`localhost` TRIGGER tr1 AFTER INSERT ON t3 FOR EACH ROW CALL foo()	latin1	latin1_swedish_ci	latin1_swedish_ci	#
DROP TRIGGER tr1;
DROP TABLE t1, t2, t3;
#
# BUG#48265 - MRG_MYISAM problem (works in 5.0.85, does't work in 5.1.40)
#
CREATE DATABASE `test/1`;
CREATE TABLE `test/1`.`t/1`(a INT);
CREATE TABLE m1(a INT) ENGINE=MERGE UNION=(`test/1`.`t/1`);
SELECT * FROM m1;
a
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TABLE `m1` (
  `a` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`test/1`.`t/1`)
DROP TABLE m1;
CREATE TABLE `test/1`.m1(a INT) ENGINE=MERGE UNION=(`test/1`.`t/1`);
SELECT * FROM `test/1`.m1;
a
SHOW CREATE TABLE `test/1`.m1;
Table	Create Table
m1	CREATE TABLE `m1` (
  `a` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`t/1`)
DROP TABLE `test/1`.m1;
DROP TABLE `test/1`.`t/1`;
CREATE TEMPORARY TABLE `test/1`.`t/1`(a INT);
CREATE TEMPORARY TABLE m1(a INT) ENGINE=MERGE UNION=(`test/1`.`t/1`);
SELECT * FROM m1;
a
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TEMPORARY TABLE `m1` (
  `a` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`test/1`.`t/1`)
DROP TABLE m1;
CREATE TEMPORARY TABLE `test/1`.m1(a INT) ENGINE=MERGE UNION=(`test/1`.`t/1`);
SELECT * FROM `test/1`.m1;
a
SHOW CREATE TABLE `test/1`.m1;
Table	Create Table
m1	CREATE TEMPORARY TABLE `m1` (
  `a` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`t/1`)
DROP TABLE `test/1`.m1;
DROP TABLE `test/1`.`t/1`;
DROP DATABASE `test/1`;
CREATE TABLE `t@1`(a INT);
SELECT * FROM m1;
a
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TABLE `m1` (
  `a` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`t@1`)
DROP TABLE `t@1`;
CREATE DATABASE `test@1`;
CREATE TABLE `test@1`.`t@1`(a INT);
FLUSH TABLE m1;
SELECT * FROM m1;
a
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TABLE `m1` (
  `a` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci UNION=(`test@1`.`t@1`)
DROP TABLE m1;
DROP TABLE `test@1`.`t@1`;
DROP DATABASE `test@1`;
#
# Bug#51494c rash with join, explain and 'sounds like' operator
#
CREATE TABLE t1 (a INT) ENGINE=MYISAM;
INSERT INTO t1 VALUES(1);
CREATE TABLE t2 (b INT NOT NULL,c INT,d INT,e BLOB NOT NULL,
KEY idx0 (d, c)) ENGINE=MERGE;
EXPLAIN SELECT * FROM t1 NATURAL RIGHT JOIN
t2 WHERE b SOUNDS LIKE e AND d = 1;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
DROP TABLE t2, t1;
#
# Bug#46339 - crash on REPAIR TABLE merge table USE_FRM
#
CREATE TABLE t1 (c1 INT) ENGINE=MYISAM;
CREATE TABLE m1 (c1 INT) ENGINE=MRG_MyISAM UNION=(t1) INSERT_METHOD=LAST;
LOCK TABLE m1 READ;
REPAIR TABLE m1 USE_FRM;
Table	Op	Msg_type	Msg_text
test.m1	repair	Error	Table 'm1' was locked with a READ lock and can't be updated
test.m1	repair	status	Operation failed
UNLOCK TABLES;
REPAIR TABLE m1 USE_FRM;
Table	Op	Msg_type	Msg_text
test.m1	repair	note	The storage engine for the table doesn't support repair
DROP TABLE m1,t1;
CREATE TABLE m1 (f1 BIGINT) ENGINE=MRG_MyISAM UNION(t1);
REPAIR TABLE m1 USE_FRM;
Table	Op	Msg_type	Msg_text
test.m1	repair	Warning	Can't open table
test.m1	repair	error	Corrupt
CREATE TABLE t1 (f1 BIGINT) ENGINE = MyISAM;
REPAIR TABLE m1 USE_FRM;
Table	Op	Msg_type	Msg_text
test.m1	repair	note	The storage engine for the table doesn't support repair
REPAIR TABLE m1;
Table	Op	Msg_type	Msg_text
test.m1	repair	note	The storage engine for the table doesn't support repair
DROP TABLE m1, t1;
CREATE TEMPORARY TABLE m1 (f1 BIGINT) ENGINE=MRG_MyISAM UNION(t1);
REPAIR TABLE m1 USE_FRM;
Table	Op	Msg_type	Msg_text
test.m1	repair	Error	Table 'test.m1' doesn't exist
test.m1	repair	error	Corrupt
CREATE TEMPORARY TABLE t1 (f1 BIGINT) ENGINE=MyISAM;
REPAIR TABLE m1 USE_FRM;
Table	Op	Msg_type	Msg_text
m1	repair	error	Cannot repair temporary table from .frm file
REPAIR TABLE m1;
Table	Op	Msg_type	Msg_text
test.m1	repair	note	The storage engine for the table doesn't support repair
DROP TABLE m1, t1;
create temporary table t1_temp(i int);
create temporary table tm_temp_temp (i int) engine=merge union=(t1_temp) insert_method=last;
alter table tm_temp_temp insert_method=first;
check table tm_temp_temp;
Table	Op	Msg_type	Msg_text
test.tm_temp_temp	check	status	OK
drop temporary table t1_temp, tm_temp_temp;
End of 5.1 tests
# 
# MDEV-4277: Crash inside mi_killed_in_mariadb() with myisammrg
# 
create table t1 (a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 ( i int ) engine=myisam;
insert into t2 values (1),(2);
create table t3 (a int, b int, filler char(100), key(a), key(b)) engine=myisam;
create table t4 like t3;
insert into t3 
select A.a+10*B.a+100*C.a, 
A.a+10*B.a+100*C.a,
'filler-data-FILLER-DATA-qqq' 
from t1 A, t1 B, t1 C where C.a < 5;
insert into t4
select A.a+10*B.a+100*C.a, 
A.a+10*B.a+100*C.a,
'filler-data-FILLER-DATA-qqq' 
from t1 A, t1 B, t1 C where C.a >= 5;
create table t5 like t3;
alter table t5 engine=merge;
alter table t5 union(t3, t4);
update t5 set b=999, a=999 where b>950;
explain 
select * from t2, t5 where t5.a=999 and t5.b=999;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	2	
1	SIMPLE	t5	index_merge	a,b	a,b	5,5	NULL	6	Using intersect(a,b); Using where; Using join buffer (flat, BNL join)
select * from t2, t5 where t5.a=999 and t5.b=999;
i	a	b	filler
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
1	999	999	filler-data-FILLER-DATA-qqq
2	999	999	filler-data-FILLER-DATA-qqq
drop table t5;
drop table t1,t2,t3,t4;
End of 5.3 tests
CREATE TABLE t1(a INT, KEY(a)) ENGINE=merge;
SELECT MAX(a) FROM t1;
MAX(a)
NULL
DROP TABLE t1;
#
# An additional test case for Bug#27430 Crash in subquery code
# when in PS and table DDL changed after PREPARE
#
# Test merge table with too many merge children.
#
set @save_table_open_cache=@@global.table_open_cache;
#
# Set @@global.table_open_cache to minimum
#
set @@global.table_open_cache=400;
select @@table_open_cache;
@@table_open_cache
400
set @a=null;
#
# Create 400 merge children
#
set @a=concat("create table t_parent (a int) union(", @a,
") insert_method=first engine=mrg_myisam");
prepare stmt from @a;
execute stmt;
prepare stmt from "select * from t_parent";
execute stmt;
execute stmt;
execute stmt;
deallocate prepare stmt;
#
# Create merge parent 
#
#
# Cleanup
#
drop table t_parent;
set @@global.table_open_cache=@save_table_open_cache;
CREATE DATABASE mysql_test1;
CREATE TABLE t1 ... DATA DIRECTORY=... INDEX DIRECTORY=...
CREATE TABLE mysql_test1.t2 ... DATA DIRECTORY=... INDEX DIRECTORY=...
CREATE TABLE m1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1,mysql_test1.t2)
INSERT_METHOD=LAST;
INSERT INTO t1 VALUES (1);
INSERT INTO mysql_test1.t2 VALUES (2);
SELECT * FROM m1;
c1
1
2
DROP TABLE t1, mysql_test1.t2, m1;
DROP DATABASE mysql_test1;
CREATE TABLE t1 (c1 INT);
CREATE TABLE t2 (c1 INT);
INSERT INTO t1 (c1) VALUES (1);
CREATE TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1,t2) INSERT_METHOD=FIRST;
CREATE TABLE t3 (c1 INT);
INSERT INTO t3 (c1) VALUES (1);
CREATE FUNCTION f1() RETURNS INT RETURN (SELECT MAX(c1) FROM t3);
CREATE VIEW v1 AS SELECT foo.c1 c1, f1() c2, bar.c1 c3, f1() c4
FROM tm1 foo, tm1 bar, t3;
SELECT * FROM v1;
c1	c2	c3	c4
1	1	1	1
DROP FUNCTION f1;
DROP VIEW v1;
DROP TABLE tm1, t1, t2, t3;
CREATE TEMPORARY TABLE t1 (c1 INT);
CREATE TEMPORARY TABLE t2 (c1 INT);
CREATE TEMPORARY TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1,t2)
INSERT_METHOD=FIRST;
CREATE FUNCTION f1() RETURNS INT RETURN (SELECT MAX(c1) FROM tm1);
INSERT INTO tm1 (c1) VALUES (1);
SELECT f1() FROM (SELECT 1) AS c1;
f1()
1
DROP FUNCTION f1;
DROP TABLE tm1, t1, t2;
CREATE FUNCTION f1() RETURNS INT
BEGIN
CREATE TEMPORARY TABLE t1 (c1 INT);
CREATE TEMPORARY TABLE t2 (c1 INT);
CREATE TEMPORARY TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1,t2);
INSERT INTO t1 (c1) VALUES (1);
RETURN (SELECT MAX(c1) FROM tm1);
END|
SELECT f1() FROM (SELECT 1 UNION SELECT 1) c1;
f1()
1
DROP FUNCTION f1;
DROP TABLE tm1, t1, t2;
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1) INSERT_METHOD=LAST;
INSERT INTO tm1 VALUES (1);
SELECT * FROM tm1;
c1
1
DROP TABLE tm1, t1;
CREATE FUNCTION f1() RETURNS INT
BEGIN
INSERT INTO tm1 VALUES (1);
RETURN (SELECT MAX(c1) FROM tm1);
END|
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1) INSERT_METHOD=LAST;
SELECT f1();
f1()
1
DROP FUNCTION f1;
DROP TABLE tm1, t1;
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1) INSERT_METHOD=LAST;
LOCK TABLE tm1 WRITE;
INSERT INTO tm1 VALUES (1);
SELECT * FROM tm1;
c1
1
UNLOCK TABLES;
DROP TABLE tm1, t1;
CREATE FUNCTION f1() RETURNS INT
BEGIN
INSERT INTO tm1 VALUES (1);
RETURN (SELECT MAX(c1) FROM tm1);
END|
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1) INSERT_METHOD=LAST;
LOCK TABLE tm1 WRITE;
SELECT f1();
f1()
1
UNLOCK TABLES;
DROP FUNCTION f1;
DROP TABLE tm1, t1;
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TABLE t2 (c1 INT) ENGINE=MyISAM;
CREATE TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1) INSERT_METHOD=LAST;
CREATE TRIGGER t2_ai AFTER INSERT ON t2
FOR EACH ROW INSERT INTO tm1 VALUES(11);
LOCK TABLE t2 WRITE;
INSERT INTO t2 VALUES (2);
SELECT * FROM tm1;
c1
11
SELECT * FROM t2;
c1
2
UNLOCK TABLES;
DROP TRIGGER t2_ai;
DROP TABLE tm1, t1, t2;
CREATE TEMPORARY TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TEMPORARY TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1)
INSERT_METHOD=LAST;
INSERT INTO tm1 VALUES (1);
SELECT * FROM tm1;
c1
1
DROP TABLE tm1, t1;
CREATE FUNCTION f1() RETURNS INT
BEGIN
INSERT INTO tm1 VALUES (1);
RETURN (SELECT MAX(c1) FROM tm1);
END|
CREATE TEMPORARY TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TEMPORARY TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1)
INSERT_METHOD=LAST;
SELECT f1();
f1()
1
DROP FUNCTION f1;
DROP TABLE tm1, t1;
CREATE TEMPORARY TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TEMPORARY TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1)
INSERT_METHOD=LAST;
CREATE TABLE t9 (c1 INT) ENGINE=MyISAM;
LOCK TABLE t9 WRITE;
INSERT INTO tm1 VALUES (1);
SELECT * FROM tm1;
c1
1
UNLOCK TABLES;
DROP TABLE tm1, t1, t9;
CREATE FUNCTION f1() RETURNS INT
BEGIN
INSERT INTO tm1 VALUES (1);
RETURN (SELECT MAX(c1) FROM tm1);
END|
CREATE TEMPORARY TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TEMPORARY TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1)
INSERT_METHOD=LAST;
CREATE TABLE t9 (c1 INT) ENGINE=MyISAM;
LOCK TABLE t9 WRITE;
SELECT f1();
f1()
1
UNLOCK TABLES;
DROP FUNCTION f1;
DROP TABLE tm1, t1, t9;
CREATE TEMPORARY TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TEMPORARY TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1)
INSERT_METHOD=LAST;
CREATE TABLE t2 (c1 INT) ENGINE=MyISAM;
CREATE TRIGGER t2_ai AFTER INSERT ON t2
FOR EACH ROW INSERT INTO tm1 VALUES(11);
LOCK TABLE t2 WRITE;
INSERT INTO t2 VALUES (2);
SELECT * FROM tm1;
c1
11
SELECT * FROM t2;
c1
2
UNLOCK TABLES;
DROP TRIGGER t2_ai;
DROP TABLE tm1, t1, t2;
#
# Don't allow an update of a MERGE child in a trigger
# if the table's already being modified by the main
# statement.
#
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1)
INSERT_METHOD=LAST;
CREATE TRIGGER tm1_ai AFTER INSERT ON tm1
FOR EACH ROW INSERT INTO t1 VALUES(11);
LOCK TABLE tm1 WRITE, t1 WRITE;
INSERT INTO tm1 VALUES (1);
ERROR HY000: Can't update table 't1' in stored function/trigger because it is already used by statement which invoked this stored function/trigger
SELECT * FROM tm1;
c1
1
UNLOCK TABLES;
LOCK TABLE t1 WRITE, tm1 WRITE;
INSERT INTO tm1 VALUES (1);
ERROR HY000: Can't update table 't1' in stored function/trigger because it is already used by statement which invoked this stored function/trigger
SELECT * FROM tm1;
c1
1
1
UNLOCK TABLES;
DROP TRIGGER tm1_ai;
DROP TABLE tm1, t1;
#
# Don't select MERGE child when trying to get a prelocked table.
#
# Due to a limitation demonstrated by the previous test
# we can no longer use a write-locked prelocked table.
# The test is kept for historical purposes.
#
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1)
INSERT_METHOD=LAST;
CREATE TRIGGER tm1_ai AFTER INSERT ON tm1
FOR EACH ROW SELECT max(c1) FROM t1 INTO @var;
LOCK TABLE tm1 WRITE, t1 WRITE;
INSERT INTO tm1 VALUES (1);
SELECT * FROM tm1;
c1
1
UNLOCK TABLES;
LOCK TABLE t1 WRITE, tm1 WRITE;
INSERT INTO tm1 VALUES (1);
SELECT * FROM tm1;
c1
1
1
UNLOCK TABLES;
DROP TRIGGER tm1_ai;
DROP TABLE tm1, t1;
CREATE TABLE t1 (c1 INT) ENGINE=MyISAM;
CREATE TABLE t2 (c1 INT) ENGINE=MyISAM;
CREATE TABLE t3 (c1 INT) ENGINE=MyISAM;
CREATE TABLE t4 (c1 INT) ENGINE=MyISAM;
CREATE TABLE t5 (c1 INT) ENGINE=MyISAM;
CREATE TABLE tm1 (c1 INT) ENGINE=MRG_MYISAM UNION=(t1,t2,t3,t4,t5)
INSERT_METHOD=LAST;
CREATE TRIGGER t2_au AFTER UPDATE ON t2
FOR EACH ROW SELECT MAX(c1) FROM t1 INTO @var;
CREATE FUNCTION f1() RETURNS INT
RETURN (SELECT MAX(c1) FROM t4);
LOCK TABLE tm1 WRITE, t1 WRITE, t2 WRITE, t3 WRITE, t4 WRITE, t5 WRITE;
INSERT INTO t1 VALUES(1);
INSERT INTO t2 VALUES(2);
INSERT INTO t3 VALUES(3);
INSERT INTO t4 VALUES(4);
INSERT INTO t5 VALUES(5);
connect  con1,localhost,root,,;
UPDATE t2, tm1 SET t2.c1=f1();
connection default;
FLUSH TABLES;
FLUSH TABLES;
UNLOCK TABLES;
connection con1;
disconnect con1;
connection default;
SELECT * FROM tm1;
c1
1
4
3
4
5
DROP TRIGGER t2_au;
DROP FUNCTION f1;
DROP TABLE tm1, t1, t2, t3, t4, t5;
#
# Bug#47633 - assert in ha_myisammrg::info during OPTIMIZE
#
CREATE TEMPORARY TABLE t1 (c1 INT);
ALTER TABLE t1 ENGINE=MERGE UNION(t_not_exists,t1);
OPTIMIZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	optimize	Error	Table 'test.t_not_exists' doesn't exist
test.t1	optimize	Error	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.t1	optimize	error	Corrupt
DROP TABLE t1;
#
# Bug#36171 - CREATE TEMPORARY TABLE and MERGE engine
# More tests with TEMPORARY MERGE table and permanent children.
# First without locked tables.
#
#
CREATE TABLE t1 (c1 INT, c2 INT) ENGINE=MyISAM;
CREATE TABLE t2 (c1 INT, c2 INT) ENGINE=MyISAM;
CREATE TEMPORARY TABLE m1 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t1,t2)
INSERT_METHOD=LAST;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TEMPORARY TABLE `m1` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
SELECT * FROM m1;
c1	c2
INSERT INTO t1 VALUES (111, 121);
INSERT INTO m1 VALUES (211, 221);
SELECT * FROM m1;
c1	c2
111	121
211	221
SELECT * FROM t1;
c1	c2
111	121
SELECT * FROM t2;
c1	c2
211	221
#
ALTER TABLE m1 RENAME m2;
SHOW CREATE TABLE m2;
Table	Create Table
m2	CREATE TEMPORARY TABLE `m2` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
SELECT * FROM m2;
c1	c2
111	121
211	221
#
CREATE TEMPORARY TABLE m1 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t1,t2)
INSERT_METHOD=LAST;
ALTER TABLE m2 RENAME m1;
ERROR 42S01: Table 'm1' already exists
DROP TABLE m1;
ALTER TABLE m2 RENAME m1;
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TEMPORARY TABLE `m1` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
SELECT * FROM m1;
c1	c2
111	121
211	221
#
ALTER TABLE m1 ADD COLUMN c3 INT;
INSERT INTO m1 VALUES (212, 222, 232);
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
SELECT * FROM m1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
ALTER TABLE t1 ADD COLUMN c3 INT;
ALTER TABLE t2 ADD COLUMN c3 INT;
INSERT INTO m1 VALUES (212, 222, 232);
SELECT * FROM m1;
c1	c2	c3
111	121	NULL
211	221	NULL
212	222	232
#
ALTER TABLE m1 DROP COLUMN c3;
INSERT INTO m1 VALUES (213, 223);
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
SELECT * FROM m1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
ALTER TABLE t1 DROP COLUMN c3;
ALTER TABLE t2 DROP COLUMN c3;
INSERT INTO m1 VALUES (213, 223);
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
#
CREATE TABLE t3 (c1 INT, c2 INT) ENGINE=MyISAM;
ALTER TABLE m1 UNION=(t1,t2,t3);
INSERT INTO m1 VALUES (311, 321);
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
311	321
SELECT * FROM t1;
c1	c2
111	121
SELECT * FROM t2;
c1	c2
211	221
212	222
213	223
SELECT * FROM t3;
c1	c2
311	321
#
CREATE TEMPORARY TABLE t4 (c1 INT, c2 INT) ENGINE=MyISAM;
ALTER TABLE m1 UNION=(t1,t2,t3,t4);
INSERT INTO m1 VALUES (411, 421);
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
311	321
411	421
SELECT * FROM t1;
c1	c2
111	121
SELECT * FROM t2;
c1	c2
211	221
212	222
213	223
SELECT * FROM t3;
c1	c2
311	321
SELECT * FROM t4;
c1	c2
411	421
#
ALTER TABLE m1 ENGINE=MyISAM;
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TEMPORARY TABLE `m1` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
INSERT INTO m1 VALUES (511, 521);
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
311	321
411	421
511	521
#
ALTER TABLE m1 ENGINE=MRG_MyISAM UNION=(t1,t2)
INSERT_METHOD=LAST;
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
SELECT * FROM t1;
c1	c2
111	121
SELECT * FROM t2;
c1	c2
211	221
212	222
213	223
#
CREATE TEMPORARY TABLE t1 (c1 INT, c2 INT) ENGINE=MyISAM;
INSERT INTO t1 VALUES (611, 621);
SELECT * FROM m1;
c1	c2
611	621
211	221
212	222
213	223
DROP TABLE t1;
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
#
#
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TEMPORARY TABLE `m1` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
#
CREATE TABLE m2 SELECT * FROM m1;
SHOW CREATE TABLE m2;
Table	Create Table
m2	CREATE TABLE `m2` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
SELECT * FROM m2;
c1	c2
111	121
211	221
212	222
213	223
DROP TABLE m2;
#
CREATE TEMPORARY TABLE m2 SELECT * FROM m1;
SHOW CREATE TABLE m2;
Table	Create Table
m2	CREATE TEMPORARY TABLE `m2` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
SELECT * FROM m2;
c1	c2
111	121
211	221
212	222
213	223
DROP TABLE m2;
#
CREATE TABLE m2 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t3,t4)
INSERT_METHOD=LAST;
SELECT * FROM m2;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE m2;
#
CREATE TABLE m2 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t3,t4)
INSERT_METHOD=LAST SELECT * FROM m1;
ERROR HY000: 'test.m2' is not of type 'BASE TABLE'
#
CREATE TEMPORARY TABLE m2 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t3,t4)
INSERT_METHOD=LAST SELECT * FROM m1;
ERROR HY000: 'test.m2' is not of type 'BASE TABLE'
#
CREATE TABLE m2 LIKE m1;
SHOW CREATE TABLE m2;
Table	Create Table
m2	CREATE TABLE `m2` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
SELECT * FROM m2;
c1	c2
111	121
211	221
212	222
213	223
INSERT INTO m2 SELECT * FROM m1;
SELECT * FROM m2;
c1	c2
111	121
211	221
212	222
213	223
111	121
211	221
212	222
213	223
DROP TABLE m2;
#
CREATE TEMPORARY TABLE m2 LIKE m1;
SHOW CREATE TABLE m2;
Table	Create Table
m2	CREATE TEMPORARY TABLE `m2` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
SELECT * FROM m2;
c1	c2
111	121
211	221
212	222
213	223
111	121
211	221
212	222
213	223
INSERT INTO m2 SELECT * FROM m1;
SELECT * FROM m2;
c1	c2
111	121
211	221
212	222
213	223
111	121
211	221
212	222
213	223
111	121
211	221
212	222
213	223
111	121
211	221
212	222
213	223
DROP TABLE m2;
#
CREATE TEMPORARY TABLE m2 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t3,t4)
INSERT_METHOD=LAST;
INSERT INTO m2 SELECT * FROM m1;
SELECT * FROM m2;
c1	c2
311	321
411	421
111	121
211	221
212	222
213	223
111	121
211	221
212	222
213	223
111	121
211	221
212	222
213	223
111	121
211	221
212	222
213	223
#
#
LOCK TABLE m1 WRITE, m2 WRITE;
SELECT * FROM m1,m2 WHERE m1.c1=m2.c1;
c1	c2	c1	c2
111	121	111	121
111	121	111	121
111	121	111	121
111	121	111	121
211	221	211	221
211	221	211	221
211	221	211	221
211	221	211	221
212	222	212	222
212	222	212	222
212	222	212	222
212	222	212	222
213	223	213	223
213	223	213	223
213	223	213	223
213	223	213	223
111	121	111	121
111	121	111	121
111	121	111	121
111	121	111	121
211	221	211	221
211	221	211	221
211	221	211	221
211	221	211	221
212	222	212	222
212	222	212	222
212	222	212	222
212	222	212	222
213	223	213	223
213	223	213	223
213	223	213	223
213	223	213	223
111	121	111	121
111	121	111	121
111	121	111	121
111	121	111	121
211	221	211	221
211	221	211	221
211	221	211	221
211	221	211	221
212	222	212	222
212	222	212	222
212	222	212	222
212	222	212	222
213	223	213	223
213	223	213	223
213	223	213	223
213	223	213	223
111	121	111	121
111	121	111	121
111	121	111	121
111	121	111	121
211	221	211	221
211	221	211	221
211	221	211	221
211	221	211	221
212	222	212	222
212	222	212	222
212	222	212	222
212	222	212	222
213	223	213	223
213	223	213	223
213	223	213	223
213	223	213	223
UNLOCK TABLES;
DROP TABLE t1, t2, t3, t4, m1, m2;
#
# Bug#36171 - CREATE TEMPORARY TABLE and MERGE engine
# More tests with TEMPORARY MERGE table and permanent children.
# (continued) Now the same with locked table.
#
CREATE TABLE t1 (c1 INT, c2 INT) ENGINE=MyISAM;
CREATE TABLE t2 (c1 INT, c2 INT) ENGINE=MyISAM;
CREATE TEMPORARY TABLE m1 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t1,t2)
INSERT_METHOD=LAST;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TEMPORARY TABLE `m1` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
SELECT * FROM m1;
c1	c2
INSERT INTO t1 VALUES (111, 121);
INSERT INTO m1 VALUES (211, 221);
SELECT * FROM m1;
c1	c2
111	121
211	221
SELECT * FROM t1;
c1	c2
111	121
SELECT * FROM t2;
c1	c2
211	221
#
LOCK TABLE m1 WRITE, t1 WRITE, t2 WRITE;
#
ALTER TABLE m1 RENAME m2;
SHOW CREATE TABLE m2;
Table	Create Table
m2	CREATE TEMPORARY TABLE `m2` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
SELECT * FROM m2;
c1	c2
111	121
211	221
#
CREATE TEMPORARY TABLE m1 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t1,t2)
INSERT_METHOD=LAST;
ALTER TABLE m2 RENAME m1;
ERROR 42S01: Table 'm1' already exists
DROP TABLE m1;
ALTER TABLE m2 RENAME m1;
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TEMPORARY TABLE `m1` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
SELECT * FROM m1;
c1	c2
111	121
211	221
#
ALTER TABLE m1 ADD COLUMN c3 INT;
INSERT INTO m1 VALUES (212, 222, 232);
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
SELECT * FROM m1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
ALTER TABLE t1 ADD COLUMN c3 INT;
ALTER TABLE t2 ADD COLUMN c3 INT;
INSERT INTO m1 VALUES (212, 222, 232);
SELECT * FROM m1;
c1	c2	c3
111	121	NULL
211	221	NULL
212	222	232
#
ALTER TABLE m1 DROP COLUMN c3;
INSERT INTO m1 VALUES (213, 223);
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
SELECT * FROM m1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
ALTER TABLE t1 DROP COLUMN c3;
ALTER TABLE t2 DROP COLUMN c3;
INSERT INTO m1 VALUES (213, 223);
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
#
UNLOCK TABLES;
CREATE TABLE t3 (c1 INT, c2 INT) ENGINE=MyISAM;
ALTER TABLE m1 UNION=(t1,t2,t3);
LOCK TABLE m1 WRITE;
INSERT INTO m1 VALUES (311, 321);
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
311	321
SELECT * FROM t1;
c1	c2
111	121
SELECT * FROM t2;
c1	c2
211	221
212	222
213	223
SELECT * FROM t3;
c1	c2
311	321
#
CREATE TEMPORARY TABLE t4 (c1 INT, c2 INT) ENGINE=MyISAM;
ALTER TABLE m1 UNION=(t1,t2,t3,t4);
INSERT INTO m1 VALUES (411, 421);
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
311	321
411	421
SELECT * FROM t1;
c1	c2
111	121
SELECT * FROM t2;
c1	c2
211	221
212	222
213	223
SELECT * FROM t3;
c1	c2
311	321
SELECT * FROM t4;
c1	c2
411	421
#
ALTER TABLE m1 ENGINE=MyISAM;
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TEMPORARY TABLE `m1` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
INSERT INTO m1 VALUES (511, 521);
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
311	321
411	421
511	521
#
ALTER TABLE m1 ENGINE=MRG_MyISAM UNION=(t1,t2)
INSERT_METHOD=LAST;
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
SELECT * FROM t1;
c1	c2
111	121
SELECT * FROM t2;
c1	c2
211	221
212	222
213	223
#
CREATE TEMPORARY TABLE t1 (c1 INT, c2 INT) ENGINE=MyISAM;
INSERT INTO t1 VALUES (611, 621);
SELECT * FROM m1;
c1	c2
611	621
211	221
212	222
213	223
DROP TABLE t1;
SELECT * FROM m1;
c1	c2
111	121
211	221
212	222
213	223
#
#
SHOW CREATE TABLE m1;
Table	Create Table
m1	CREATE TEMPORARY TABLE `m1` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
CREATE TABLE m2 SELECT * FROM m1;
ERROR HY000: Table 'm2' was not locked with LOCK TABLES
#
CREATE TEMPORARY TABLE m2 SELECT * FROM m1;
SHOW CREATE TABLE m2;
Table	Create Table
m2	CREATE TEMPORARY TABLE `m2` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci
SELECT * FROM m2;
c1	c2
111	121
211	221
212	222
213	223
DROP TABLE m2;
#
CREATE TEMPORARY TABLE m2 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t3,t4)
INSERT_METHOD=LAST;
SELECT * FROM m2;
c1	c2
311	321
411	421
LOCK TABLE m1 WRITE, m2 WRITE;
UNLOCK TABLES;
DROP TABLE m2;
LOCK TABLE m1 WRITE;
#
# ER_TABLE_NOT_LOCKED is returned in ps-protocol
CREATE TABLE m2 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t3,t4)
INSERT_METHOD=LAST SELECT * FROM m1;
Got one of the listed errors
#
CREATE TEMPORARY TABLE m2 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t3,t4)
INSERT_METHOD=LAST SELECT * FROM m1;
ERROR HY000: 'test.m2' is not of type 'BASE TABLE'
#
CREATE TEMPORARY TABLE m2 LIKE m1;
SHOW CREATE TABLE m2;
Table	Create Table
m2	CREATE TEMPORARY TABLE `m2` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
LOCK TABLE m1 WRITE, m2 WRITE;
SHOW CREATE TABLE m2;
Table	Create Table
m2	CREATE TEMPORARY TABLE `m2` (
  `c1` int(11) DEFAULT NULL,
  `c2` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=LAST UNION=(`t1`,`t2`)
SELECT * FROM m2;
c1	c2
111	121
211	221
212	222
213	223
INSERT INTO m2 SELECT * FROM m1;
SELECT * FROM m2;
c1	c2
111	121
211	221
212	222
213	223
111	121
211	221
212	222
213	223
DROP TABLE m2;
#
CREATE TEMPORARY TABLE m2 (c1 INT, c2 INT) ENGINE=MRG_MyISAM UNION=(t3,t4)
INSERT_METHOD=LAST;
LOCK TABLE m1 WRITE, m2 WRITE;
INSERT INTO m2 SELECT * FROM m1;
SELECT * FROM m2;
c1	c2
311	321
411	421
111	121
211	221
212	222
213	223
111	121
211	221
212	222
213	223
#
UNLOCK TABLES;
DROP TABLE t1, t2, t3, t4, m1, m2;
#
# Bug47098 assert in MDL_context::destroy on HANDLER
#          <damaged merge table> OPEN
#
# Test that merge tables are closed correctly when opened using 
# HANDLER ... OPEN.
# The general case.
connect  con1,localhost,root,,;
CREATE TABLE t1 (c1 int);
CREATE TABLE t2 (c1 int);
CREATE TABLE t3 (c1 int) ENGINE = MERGE UNION (t1,t2);
START TRANSACTION;
HANDLER t3 OPEN;
ERROR HY000: Storage engine MRG_MyISAM of the table `test`.`t3` doesn't have this option
DROP TABLE t1, t2, t3;
connection default;
# all mdl_tickets must have been released.
disconnect con1;
# The bug-specific case.
connect  con1,localhost,root,,;
CREATE TABLE t1 (c1 int);
CREATE TABLE t2 (c1 int);
CREATE TABLE t3 (c1 int) ENGINE = MERGE UNION (t1,t2);
DROP TABLE t2;
START TRANSACTION;
HANDLER t3 OPEN;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TABLE t1, t3;
connection default;
# all mdl_tickets must have been released.
disconnect con1;
#
# A test case for Bug#47648   main.merge fails sporadically
#
# Make sure we correctly maintain lex->query_tables_last_own.
#
create table t1 (c1 int not null);
create table t2 (c1 int not null);
create table t3 (c1 int not null);
create function f1 () returns int return (select max(c1) from t3);
create table t4 (c1 int not null) engine=merge union=(t1,t2) insert_method=last ;
select * from t4 where c1 < f1();
c1
prepare stmt from "select * from t4 where c1 < f1()";
execute stmt;
c1
execute stmt;
c1
execute stmt;
c1
drop function f1;
execute stmt;
ERROR 42000: FUNCTION test.f1 does not exist
execute stmt;
ERROR 42000: FUNCTION test.f1 does not exist
drop table t4, t3, t2, t1;
#
# Bug#51240 ALTER TABLE of a locked MERGE table fails
#
CREATE TABLE t1 (c1 INT);
CREATE TABLE m1 (c1 INT) ENGINE=MRG_MyISAM UNION=(t1);
LOCK TABLE m1 WRITE;
ALTER TABLE m1 ADD INDEX (c1);
UNLOCK TABLES;
DROP TABLE m1, t1;
#
# Locking the merge table won't implicitly lock children.
#
CREATE TABLE t1 (c1 INT);
CREATE TABLE m1 (c1 INT) ENGINE=MRG_MyISAM UNION=(t1);
LOCK TABLE m1 WRITE;
ALTER TABLE t1 ADD INDEX (c1);
ERROR HY000: Table 't1' was locked with a READ lock and can't be updated
LOCK TABLE m1 WRITE, t1 WRITE;
ALTER TABLE t1 ADD INDEX (c1);
UNLOCK TABLES;
DROP TABLE m1, t1;
#
# Test for bug #37371 "CREATE TABLE LIKE merge loses UNION parameter"
#
create table t1 (i int) engine=myisam;
create table m1 (i int) engine=mrg_myisam union=(t1) insert_method=first;
create table m2 like m1;
# Table definitions should match
show create table m1;
Table	Create Table
m1	CREATE TABLE `m1` (
  `i` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=FIRST UNION=(`t1`)
show create table m2;
Table	Create Table
m2	CREATE TABLE `m2` (
  `i` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_swedish_ci INSERT_METHOD=FIRST UNION=(`t1`)
drop tables m1, m2, t1;
#
# Test case for Bug#54811 "Assert in mysql_lock_have_duplicate()"
# Check that unique_table() works correctly for merge tables.
#
create table t1 (a int);
create table t2 (a int);
create table t3 (b int);
create view v1 as select * from t3,t1;
create table m1 (a int) engine=merge union (t1, t2) insert_method=last;
create table m2 (a int) engine=merge union (t1, t2) insert_method=first;
create temporary table tmp (b int);
insert into tmp (b) values (1);
insert into t1 (a) values (1);
insert into t3 (b) values (1);
insert into m1 (a) values ((select max(a) from m1));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from m2));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from t1));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from t2));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from t3, m1));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from t3, m2));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from t3, t1));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from t3, t2));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from tmp, m1));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from tmp, m2));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from tmp, t1));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from tmp, t2));
ERROR HY000: Table 'm1' is specified twice, both as a target for 'INSERT' and as a separate source for data
insert into m1 (a) values ((select max(a) from v1));
ERROR HY000: The definition of table 'v1' prevents operation INSERT on table 'm1'
insert into m1 (a) values ((select max(a) from tmp, v1));
ERROR HY000: The definition of table 'v1' prevents operation INSERT on table 'm1'
drop view v1;
drop temporary table tmp;
drop table t1, t2, t3, m1, m2;
#
# Bug#56494 Segfault in upgrade_shared_lock_to_exclusive() for
#           REPAIR of merge table
#
CREATE TABLE t1(a INT);
ALTER TABLE t1 engine= MERGE UNION (t_not_exists);
ANALYZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	Error	Table 'test.t_not_exists' doesn't exist
test.t1	analyze	Error	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.t1	analyze	error	Corrupt
CHECK TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	check	Error	Table 'test.t_not_exists' is differently defined or of non-MyISAM type or doesn't exist
test.t1	check	Error	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.t1	check	error	Corrupt
CHECKSUM TABLE t1;
Table	Checksum
test.t1	NULL
Warnings:
Error	1146	Table 'test.t_not_exists' doesn't exist
Error	1168	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
OPTIMIZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	optimize	Error	Table 'test.t_not_exists' doesn't exist
test.t1	optimize	Error	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.t1	optimize	error	Corrupt
REPAIR TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	repair	Error	Table 'test.t_not_exists' is differently defined or of non-MyISAM type or doesn't exist
test.t1	repair	Error	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.t1	repair	error	Corrupt
REPAIR TABLE t1 USE_FRM;
Table	Op	Msg_type	Msg_text
test.t1	repair	Warning	Can't open table
test.t1	repair	error	Corrupt
DROP TABLE t1;
CREATE TABLE t1(a INT);
CREATE TABLE t2(a INT) engine= MERGE UNION (t1);
REPAIR TABLE t2 USE_FRM;
Table	Op	Msg_type	Msg_text
test.t2	repair	note	The storage engine for the table doesn't support repair
DROP TABLE t1, t2;
#
# Bug#57002 Assert in upgrade_shared_lock_to_exclusive()
#           for ALTER TABLE + MERGE tables
#
CREATE TABLE t1(a INT) engine=myisam;
CREATE TABLE m1(a INT) engine=merge UNION(t1);
LOCK TABLES t1 READ, m1 WRITE;
ALTER TABLE t1 engine=myisam;
ERROR HY000: Table 't1' was locked with a READ lock and can't be updated
UNLOCK TABLES;
DROP TABLE m1, t1;
#
# Test for bug #11754210 - "45777: CHECK TABLE DOESN'T SHOW ALL
#                           PROBLEMS FOR MERGE TABLE COMPLIANCE IN 5.1"
#
create table t1(id int) engine=myisam;
create view t3 as select 1 as id;
create table t4(id int) engine=memory;
create table m1(id int) engine=merge union=(t1,t2,t3,t4);
select * from m1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
# The below CHECK and REPAIR TABLE statements should
# report all problems with underlying tables: 
# - absence of 't2',
# - missing base table for 't3',
# - wrong engine of 't4'.
check table m1;
Table	Op	Msg_type	Msg_text
test.m1	check	Error	Table 'test.t2' is differently defined or of non-MyISAM type or doesn't exist
test.m1	check	Error	Table 'test.t3' is differently defined or of non-MyISAM type or doesn't exist
test.m1	check	Error	Table 'test.t4' is differently defined or of non-MyISAM type or doesn't exist
test.m1	check	Error	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.m1	check	error	Corrupt
repair table m1;
Table	Op	Msg_type	Msg_text
test.m1	repair	Error	Table 'test.t2' is differently defined or of non-MyISAM type or doesn't exist
test.m1	repair	Error	Table 'test.t3' is differently defined or of non-MyISAM type or doesn't exist
test.m1	repair	Error	Table 'test.t4' is differently defined or of non-MyISAM type or doesn't exist
test.m1	repair	Error	Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
test.m1	repair	error	Corrupt
# Clean-up.
drop tables m1, t1, t4;
drop view t3;
#
# MDEV-10424 Assertion `ticket == __null' failed in MDL_request::set_type
#
CREATE TABLE t1 (f1 INT) ENGINE=MyISAM;
CREATE TABLE tmerge (f1 INT) ENGINE=MERGE UNION=(t1);
PREPARE stmt FROM "ANALYZE TABLE tmerge, t1";
EXECUTE stmt;
Table	Op	Msg_type	Msg_text
test.tmerge	analyze	status	Engine-independent statistics collected
test.tmerge	analyze	note	The storage engine for the table doesn't support analyze
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	Table is already up to date
EXECUTE stmt;
Table	Op	Msg_type	Msg_text
test.tmerge	analyze	status	Engine-independent statistics collected
test.tmerge	analyze	note	The storage engine for the table doesn't support analyze
test.t1	analyze	status	Engine-independent statistics collected
test.t1	analyze	status	Table is already up to date
DEALLOCATE PREPARE stmt;
DROP TABLE t1, tmerge;
#
# End of 5.5 tests
#
#
# Additional coverage for refactoring which is made as part
# of fix for bug #27480 "Extend CREATE TEMPORARY TABLES privilege
# to allow temp table operations".
# 
# Check that prelocking works correctly for various variants of
# merge tables.
# 
create table t1 (j int);
insert into t1 values (1);
create function f1() returns int return (select count(*) from m1);
create temporary table t2 (a int) engine=myisam;
insert into t2 values (1);
create temporary table m1 (a int) engine=merge union=(t2);
select f1() from t1;
f1()
1
drop tables t2, m1;
create table t2 (a int) engine=myisam;
insert into t2 values (1);
create table m1 (a int) engine=merge union=(t2);
select f1() from t1;
f1()
1
drop table m1;
create temporary table m1 (a int) engine=merge union=(t2);
select f1() from t1;
f1()
1
drop tables t1, t2, m1;
drop function f1;
#
# Check that REPAIR/CHECK and CHECKSUM statements work correctly
# for various variants of merge tables.
create table t1 (a int) engine=myisam;
insert into t1 values (1);
create table m1 (a int) engine=merge union=(t1);
check table m1;
Table	Op	Msg_type	Msg_text
test.m1	check	status	OK
repair table m1;
Table	Op	Msg_type	Msg_text
test.m1	repair	note	The storage engine for the table doesn't support repair
checksum table m1;
Table	Checksum
test.m1	3459908756
drop tables t1, m1;
create temporary table t1 (a int) engine=myisam;
insert into t1 values (1);
create temporary table m1 (a int) engine=merge union=(t1);
check table m1;
Table	Op	Msg_type	Msg_text
test.m1	check	status	OK
repair table m1;
Table	Op	Msg_type	Msg_text
test.m1	repair	note	The storage engine for the table doesn't support repair
checksum table m1;
Table	Checksum
test.m1	3459908756
drop tables t1, m1;
create table t1 (a int) engine=myisam;
insert into t1 values (1);
create temporary table m1 (a int) engine=merge union=(t1);
check table m1;
Table	Op	Msg_type	Msg_text
test.m1	check	status	OK
repair table m1;
Table	Op	Msg_type	Msg_text
test.m1	repair	note	The storage engine for the table doesn't support repair
checksum table m1;
Table	Checksum
test.m1	3459908756
drop tables t1, m1;
CREATE TABLE t1(a INT);
CREATE TABLE m1(a INT) ENGINE = MERGE UNION (q1, q2);
CREATE TRIGGER trg1 BEFORE DELETE ON t1
FOR EACH ROW
INSERT INTO m1 VALUES (1);
DELETE FROM t1;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
DROP TRIGGER trg1;
DROP TABLE t1;
DROP TABLE m1;
set global default_storage_engine=@save_default_storage_engine;
#
# End of 10.0 tests
#
#
# MDEV-27407 Different ASC/DESC index attributes on MERGE and underlying table can cause wrong results
#
create table t (a int, key(a desc)) engine=myisam;
create table tm (a int, key(a)) engine=merge union(t);
select * from tm;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
drop table tm, t;
#
# MDEV-27586 Auto-increment does not work with DESC on MERGE table
#
create table t (a int not null, primary key(a desc)) engine=myisam;
create table tm (a int not null auto_increment, primary key(a desc)) engine=merge union=(t) insert_method=first;
insert into tm () values ();
insert into tm () values ();
insert into tm () values ();
select * from tm;
a
3
2
1
drop table tm, t;
#
# End of 10.8 tests
#
#
# MDEV-30088 Assertion `cond_selectivity <= 1.0' failed in get_range_limit_read_cost
#
CREATE TABLE t1 (a TIMESTAMP, KEY(a)) ENGINE=MRG_MyISAM;
explain SELECT a, COUNT(*) FROM t1 WHERE a >= '2000-01-01 00:00:00' GROUP BY a;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE noticed after reading const tables
SELECT a, COUNT(*) FROM t1 WHERE a >= '2000-01-01 00:00:00' GROUP BY a;
a	COUNT(*)
DROP TABLE t1;
#
# MDEV-30525: Assertion `ranges > 0' fails in IO_AND_CPU_COST handler::keyread_time
#
CREATE TABLE t1 (a INT, KEY(a)) ENGINE=MyISAM;
CREATE TABLE t2 (a INT, KEY(a)) ENGINE=MyISAM;
CREATE TABLE tm (a INT, KEY(a)) ENGINE=MRG_MyISAM UNION=(t1,t2);
SELECT DISTINCT a FROM tm WHERE a > 50;
a
DROP TABLE tm, t1, t2;
#
# End of 11.0 tests
#