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mariadb/mysql-test/r/merge.result
unknown 5b8cdbf4a6 Fixed bug#36006: Optimizer does table scan for SELECT COUNT(*) 
for ENGINE=MRG_MYISAM (should be optimized out).

Before WL#3281 MERGE engine had the HA_NOT_EXACT_COUNT flag
unset, and it worked with COUNT optimization as desired.
After the removal of the HA_NOT_EXACT_COUNT flag neither
HA_STATS_RECORDS_IS_EXACT (opposite to former HA_NOT_EXACT_COUNT
flag) nor modern HA_HAS_RECORDS flag were not added to MERGE
table flag mask.

1. The HA_HAS_RECORDS table flag has been set.
2. The ha_myisammrg::records method has been overridden to
   calculate total number of records in underlying tables.



storage/myisammrg/myrg_records.c:
  Fixed bug#36006: Optimizer does table scan for select count(*).
  The myrg_records function has been added to calculate total number
  of records in underlying tables.
include/myisammrg.h:
  Fixed bug#36006: Optimizer does table scan for select count(*).
  The myrg_records function declaration has been added.
mysql-test/r/merge.result:
  Added test case for bug#36006.
mysql-test/t/merge.test:
  Added test case for bug#36006.
storage/myisammrg/CMakeLists.txt:
  Fixed bug#36006: Optimizer does table scan for select count(*).
  New myrg_records.c file has been added.
storage/myisammrg/Makefile.am:
  Fixed bug#36006: Optimizer does table scan for select count(*).
  New myrg_records.c file has been added.
storage/myisammrg/ha_myisammrg.cc:
  Fixed bug#36006: Optimizer does table scan for select count(*).
  The ha_myisammrg::records method has been overridden.
storage/myisammrg/ha_myisammrg.h:
  Fixed bug#36006: Optimizer does table scan for select count(*).
  1. The HA_HAS_RECORDS table flag has been set.
  2. The ha_myisammrg::records method has been overridden.
2008-04-26 02:45:58 +05:00

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drop table if exists t1,t2,t3,t4,t5,t6;
drop database if exists mysqltest;
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 18 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 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 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 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 UNION=(`t1`,`t2`)
drop table t3,t2,t1;
create table t1 (a int not null, key(a)) engine=merge;
select * from t1;
ERROR HY000: Got error 124 from storage engine
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
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 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 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 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 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 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;
ERROR HY000: Unable to open underlying table which is differently defined or of non-MyISAM type or doesn't exist
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;
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...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 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 5 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 5 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 5 Using where
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 BASE TABLE
create table t3 engine=merge union=(t1, t2) select * from t2;
ERROR HY000: 'test.t3' is not BASE TABLE
create table t3 engine=merge union=(t1, t2) select (select max(a) from t2);
ERROR HY000: 'test.t3' is not 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 2 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 2 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
t3 1 a 1 a A NULL NULL NULL YES BTREE
t3 1 a 2 b A NULL NULL NULL YES BTREE
t3 1 a 3 c A NULL NULL NULL YES BTREE
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 42S02: Table 'test.t3' 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 42S02: Table 'test.t1' doesn't exist
CHECK TABLE tm1;
Table Op Msg_type Msg_text
test.tm1 check Error Table 'test.t1' doesn't exist
test.tm1 check error Corrupt
CREATE TABLE t1(a INT);
SELECT * FROM tm1;
ERROR 42S02: Table 'test.t2' doesn't exist
CHECK TABLE tm1;
Table Op Msg_type Msg_text
test.tm1 check Error Table 'test.t2' 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;
ERROR HY000: You can't specify target table 't1' for update in FROM clause
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
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
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
DROP TABLE t1, m1;
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;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
SELECT * FROM t3;
c1
1
2
#
# Truncate child table under locked tables.
TRUNCATE TABLE t1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
SELECT * FROM t3;
c1
1
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;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
SELECT * FROM t3;
c1
1
2
#
# Truncate temporary child table under locked tables.
TRUNCATE TABLE t1;
ERROR HY000: Can't execute the given command because you have active locked tables or an active transaction
SELECT * FROM t3;
c1
1
2
UNLOCK TABLES;
DROP TABLE t1, t2, t3, t4;
CREATE TABLE t1 (c1 INT) ENGINE= MyISAM;
CREATE TABLE t2 (c1 INT) ENGINE= MRG_MYISAM UNION= (t1) INSERT_METHOD= LAST;
REPAIR TABLE t1;
INSERT INTO t2 VALUES (1);
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;
INSERT INTO t2 VALUES (1);
REPAIR TABLE t1;
Table Op Msg_type Msg_text
test.t1 repair status OK
UNLOCK TABLES;
DROP TABLE t1, t2;
CREATE TABLE t1 (c1 INT) ENGINE= MyISAM;
LOCK TABLE t1 WRITE;
INSERT INTO t1 VALUES (1);
FLUSH TABLES;
FLUSH TABLES;
SELECT * FROM t1;
c1
UNLOCK TABLES;
DROP TABLE t1;
#
# 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 BASE TABLE
SHOW CREATE TABLE t3;
ERROR 42S02: Table 'test.t3' doesn't exist
DROP TABLE t1, t2;
#
# CREATE ... LIKE
#
# 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
INSERT INTO t4 VALUES (4);
ERROR HY000: Table 't4' is read only
DROP TABLE t4;
#
# 1. Create like with locked tables.
LOCK TABLES t3 WRITE, t2 WRITE, t1 WRITE;
CREATE TABLE t4 LIKE t3;
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
UNLOCK TABLES;
SHOW CREATE TABLE t4;
Table Create Table
t4 CREATE TABLE `t4` (
`c1` int(11) DEFAULT NULL
) ENGINE=MRG_MyISAM DEFAULT CHARSET=latin1
INSERT INTO t4 VALUES (4);
ERROR HY000: Table 't4' is read only
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
RENAME TABLE t2 TO t5;
SELECT * FROM t3 ORDER BY c1;
ERROR 42S02: Table 'test.t2' doesn't exist
RENAME TABLE t5 TO t2;
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
#
# 3. Normal rename with locked tables.
LOCK TABLES t1 WRITE, t2 WRITE, t3 WRITE;
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
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
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
UNLOCK TABLES;
#
# 4. Alter table rename.
ALTER TABLE t2 RENAME TO t5;
SELECT * FROM t3 ORDER BY c1;
ERROR 42S02: Table 'test.t2' doesn't exist
ALTER TABLE t5 RENAME TO t2;
SELECT * FROM t3 ORDER BY c1;
c1
1
2
3
#
# 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 't3' 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
#
# 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
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
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
#
# 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
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 42S02: Table 'test.t1' doesn't exist
SELECT * FROM t1;
ERROR 42S02: Table 'test.t1' doesn't exist
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 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 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 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_ai 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_ai;
# Trigger on parent under LOCK TABLES
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
CREATE TRIGGER t4_ai 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_ai;
UNLOCK TABLES;
#
# Trigger on child
DELETE FROM t4 WHERE c1 = 4;
CREATE TRIGGER t3_ai 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_ai;
# Trigger on child under LOCK TABLES
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
CREATE TRIGGER t3_ai 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_ai;
#
# Trigger with table use on child
DELETE FROM t4 WHERE c1 = 4;
CREATE TRIGGER t3_ai 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
DELETE FROM t4 WHERE c1 = 22;
DELETE FROM t4 WHERE c1 = 33;
DROP TRIGGER t3_ai;
# Trigger with table use on child under LOCK TABLES
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
CREATE TRIGGER t3_ai 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_ai;
DELETE FROM t4 WHERE c1 = 22;
DELETE FROM t4 WHERE c1 = 33;
UNLOCK TABLES;
#
# 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
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
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
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
4
UNLOCK TABLES;
#
# Checksum
#
CHECKSUM TABLE t4;
Table Checksum
test.t4 46622073
CHECKSUM TABLE t2;
Table Checksum
test.t2 3700403066
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
4
LOCK TABLES t3 WRITE, t2 WRITE, t4 WRITE, t1 WRITE;
CHECKSUM TABLE t4;
Table Checksum
test.t4 46622073
CHECKSUM TABLE t2;
Table Checksum
test.t2 3700403066
SELECT * FROM t4 ORDER BY c1;
c1
1
2
3
4
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
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
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 @rnd= RAND();
SET @id = CAST(@rnd * @rnd_max AS UNSIGNED);
SET @id_rev= @rnd_max - @id;
SET @grp= CAST(127.0 * @rnd AS UNSIGNED);
INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev);
SET @rnd= RAND();
SET @id = CAST(@rnd * @rnd_max AS UNSIGNED);
SET @id_rev= @rnd_max - @id;
SET @grp= CAST(127.0 * @rnd AS UNSIGNED);
INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev);
SET @rnd= RAND();
SET @id = CAST(@rnd * @rnd_max AS UNSIGNED);
SET @id_rev= @rnd_max - @id;
SET @grp= CAST(127.0 * @rnd AS UNSIGNED);
INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev);
SET @rnd= RAND();
SET @id = CAST(@rnd * @rnd_max AS UNSIGNED);
SET @id_rev= @rnd_max - @id;
SET @grp= CAST(127.0 * @rnd AS UNSIGNED);
INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev);
SET @rnd= RAND();
SET @id = CAST(@rnd * @rnd_max AS UNSIGNED);
SET @id_rev= @rnd_max - @id;
SET @grp= CAST(127.0 * @rnd AS UNSIGNED);
INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev);
SET @rnd= RAND();
SET @id = CAST(@rnd * @rnd_max AS UNSIGNED);
SET @id_rev= @rnd_max - @id;
SET @grp= CAST(127.0 * @rnd AS UNSIGNED);
INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev);
SET @rnd= RAND();
SET @id = CAST(@rnd * @rnd_max AS UNSIGNED);
SET @id_rev= @rnd_max - @id;
SET @grp= CAST(127.0 * @rnd AS UNSIGNED);
INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev);
SET @rnd= RAND();
SET @id = CAST(@rnd * @rnd_max AS UNSIGNED);
SET @id_rev= @rnd_max - @id;
SET @grp= CAST(127.0 * @rnd AS UNSIGNED);
INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev);
SET @rnd= RAND();
SET @id = CAST(@rnd * @rnd_max AS UNSIGNED);
SET @id_rev= @rnd_max - @id;
SET @grp= CAST(127.0 * @rnd AS UNSIGNED);
INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev);
SET @rnd= RAND();
SET @id = CAST(@rnd * @rnd_max AS UNSIGNED);
SET @id_rev= @rnd_max - @id;
SET @grp= CAST(127.0 * @rnd AS UNSIGNED);
INSERT INTO t1 (id, grp, id_rev) VALUES (@id, @grp, @id_rev);
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
SELECT COUNT(DISTINCT a1.id) FROM t3 AS a1, t3 AS a2
WHERE a1.id = a2.id GROUP BY a2.grp;
TRUNCATE TABLE t1;
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 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;
End of 5.1 tests
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