drop table if exists t1,t2,t3;
SET SQL_WARNINGS=1;
CREATE TABLE t1 (
ID CHAR(32) NOT NULL,
name CHAR(32) NOT NULL,
value CHAR(255),
INDEX indexIDname (ID(8),name(8))
) ;
INSERT INTO t1 VALUES
('keyword','indexdir','/export/home/local/www/database/indexes/keyword');
INSERT INTO t1 VALUES ('keyword','urlprefix','text/ /text');
INSERT INTO t1 VALUES ('keyword','urlmap','/text/ /');
INSERT INTO t1 VALUES ('keyword','attr','personal employee company');
INSERT INTO t1 VALUES
('emailgids','indexdir','/export/home/local/www/database/indexes/emailgids');
INSERT INTO t1 VALUES ('emailgids','urlprefix','text/ /text');
INSERT INTO t1 VALUES ('emailgids','urlmap','/text/ /');
INSERT INTO t1 VALUES ('emailgids','attr','personal employee company');
SELECT value FROM t1 WHERE ID='emailgids' AND name='attr';
value
personal employee company
drop table t1;
CREATE TABLE t1 (
price int(5) DEFAULT '0' NOT NULL,
area varchar(40) DEFAULT '' NOT NULL,
type varchar(40) DEFAULT '' NOT NULL,
transityes enum('Y','N') DEFAULT 'Y' NOT NULL,
shopsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
schoolsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
petsyes enum('Y','N') DEFAULT 'Y' NOT NULL,
KEY price (price,area,type,transityes,shopsyes,schoolsyes,petsyes)
);
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','N','N','N','N');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','N','N','N','N');
INSERT IGNORE INTO t1 VALUES (900,'Vancouver','Shared/Roomate','','','','');
Warnings:
Warning	1265	Data truncated for column 'transityes' at row 1
Warning	1265	Data truncated for column 'shopsyes' at row 1
Warning	1265	Data truncated for column 'schoolsyes' at row 1
Warning	1265	Data truncated for column 'petsyes' at row 1
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
INSERT INTO t1 VALUES (900,'Vancouver','Shared/Roomate','Y','Y','Y','Y');
SELECT * FROM t1 WHERE area='Vancouver' and transityes='y' and schoolsyes='y' and ( ((type='1 Bedroom' or type='Studio/Bach') and (price<=500)) or ((type='2 Bedroom') and (price<=550)) or ((type='Shared/Roomate') and (price<=300)) or ((type='Room and Board') and (price<=500)) ) and price <= 400;
price	area	type	transityes	shopsyes	schoolsyes	petsyes
drop table t1;
CREATE TABLE t1 (program enum('signup','unique','sliding') not null,  type enum('basic','sliding','signup'),  sites set('mt'),  PRIMARY KEY (program));
ALTER TABLE t1 modify program enum('signup','unique','sliding');
drop table t1;
CREATE TABLE t1 (
name varchar(50) DEFAULT '' NOT NULL,
author varchar(50) DEFAULT '' NOT NULL,
category decimal(10,0) DEFAULT '0' NOT NULL,
email varchar(50),
password varchar(50),
proxy varchar(50),
bitmap varchar(20),
msg varchar(255),
urlscol varchar(127),
urlhttp varchar(127),
timeout decimal(10,0),
nbcnx decimal(10,0),
creation decimal(10,0),
livinguntil decimal(10,0),
lang decimal(10,0),
type decimal(10,0),
subcat decimal(10,0),
subtype decimal(10,0),
reg char(1),
scs varchar(255),
capacity decimal(10,0),
userISP varchar(50),
CCident varchar(50) DEFAULT '' NOT NULL,
PRIMARY KEY (name,author,category)
);
INSERT INTO t1 VALUES
('patnom','patauteur',0,'p.favre@cryo-networks.fr',NULL,NULL,'#p2sndnq6ae5g1u6t','essai salut','scol://195.242.78.119:patauteur.patnom',NULL,NULL,NULL,950036174,-882087474,NULL,3,0,3,'1','Pub/patnom/futur_divers.scs',NULL,'pat','CC1');
INSERT INTO t1 VALUES
('LeNomDeMonSite','Marc',0,'m.barilley@cryo-networks.fr',NULL,NULL,NULL,NULL,'scol://195.242.78.119:Marc.LeNomDeMonSite',NULL,NULL,NULL,950560434,-881563214,NULL,3,0,3,'1','Pub/LeNomDeMonSite/domus_hibere.scs',NULL,'Marq','CC1');
select * from t1 where name='patnom' and author='patauteur' and category=0;
name	author	category	email	password	proxy	bitmap	msg	urlscol	urlhttp	timeout	nbcnx	creation	livinguntil	lang	type	subcat	subtype	reg	scs	capacity	userISP	CCident
patnom	patauteur	0	p.favre@cryo-networks.fr	NULL	NULL	#p2sndnq6ae5g1u6t	essai salut	scol://195.242.78.119:patauteur.patnom	NULL	NULL	NULL	950036174	-882087474	NULL	3	0	3	1	Pub/patnom/futur_divers.scs	NULL	pat	CC1
drop table t1;
create table t1
(
name_id int not null auto_increment,
name blob,
INDEX name_idx (name(5)),
primary key (name_id)
);
INSERT t1 VALUES(NULL,'/');
INSERT t1 VALUES(NULL,'[T,U]_axpby');
SELECT * FROM t1 WHERE name='[T,U]_axpy';
name_id	name
SELECT * FROM t1 WHERE name='[T,U]_axpby';
name_id	name
2	[T,U]_axpby
create table t2
(
name_id int not null auto_increment,
name char(255) binary,
INDEX name_idx (name(5)),
primary key (name_id)
);
Warnings:
Warning	1287	'BINARY as attribute of a type' is deprecated and will be removed in a future release. Please use a CHARACTER SET clause with _bin collation instead
INSERT t2 select * from t1;
SELECT * FROM t2 WHERE name='[T,U]_axpy';
name_id	name
SELECT * FROM t2 WHERE name='[T,U]_axpby';
name_id	name
2	[T,U]_axpby
CREATE TABLE t3 SELECT * FROM t2 WHERE name='[T,U]_axpby';
SELECT * FROM t2 WHERE name='[T,U]_axpby';
name_id	name
2	[T,U]_axpby
drop table t1,t2,t3;
create table t1
(
SEQNO                         numeric(12 ) not null,
MOTYPEID                 numeric(12 ) not null,
MOINSTANCEID     numeric(12 ) not null,
ATTRID                       numeric(12 ) not null,
VALUE                         varchar(120) not null,
primary key (SEQNO, MOTYPEID, MOINSTANCEID, ATTRID, VALUE )
);
INSERT INTO t1 VALUES (1, 1, 1, 1, 'a');
INSERT INTO t1 VALUES (1, 1, 1, 1, 'b');
INSERT INTO t1 VALUES (1, 1, 1, 1, 'a');
ERROR 23000: Duplicate entry '1-1-1-1-a' for key 'PRIMARY'
drop table t1;
CREATE TABLE t1 (
a tinytext NOT NULL,
b tinyint(3) unsigned NOT NULL default '0',
PRIMARY KEY (a(32),b)
) ENGINE=MyISAM;
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
INSERT INTO t1 VALUES ('a',1),('a',2);
SELECT * FROM t1 WHERE a='a' AND b=2;
a	b
a	2
SELECT * FROM t1 WHERE a='a' AND b in (2);
a	b
a	2
SELECT * FROM t1 WHERE a='a' AND b in (1,2);
a	b
a	1
a	2
drop table t1;
create table t1 (a int not null unique, b int unique, c int, d int not null primary key, key(c), e int not null unique);
analyze table t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
show keys from t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment	Visible	Expression
t1	0	PRIMARY	1	d	A	0	NULL	NULL		SE_SPECIFIC			YES	NULL
t1	0	a	1	a	A	0	NULL	NULL		SE_SPECIFIC			YES	NULL
t1	0	e	1	e	A	0	NULL	NULL		SE_SPECIFIC			YES	NULL
t1	0	b	1	b	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
t1	1	c	1	c	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
drop table t1;
CREATE TABLE t1 (c CHAR(10) NOT NULL,i INT NOT NULL AUTO_INCREMENT,
UNIQUE (c,i)) ENGINE=MYISAM;
INSERT IGNORE INTO t1 (c) VALUES (NULL),(NULL);
Warnings:
Warning	1048	Column 'c' cannot be null
SELECT * FROM t1;
c	i
	1
	2
INSERT INTO t1 (c) VALUES ('a'),('a');
SELECT * FROM t1;
c	i
	1
	2
a	1
a	2
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (c CHAR(10) NULL, i INT NOT NULL AUTO_INCREMENT,
UNIQUE (c,i)) ENGINE=MYISAM;
INSERT INTO t1 (c) VALUES (NULL),(NULL);
SELECT * FROM t1;
c	i
NULL	1
NULL	2
INSERT INTO t1 (c) VALUES ('a'),('a');
SELECT * FROM t1;
c	i
NULL	1
NULL	2
a	1
a	2
drop table t1;
create table t1 (i int, a char(200), b text, unique (a), unique (b(300))) charset utf8 row_format=dynamic engine=innodb;
Warnings:
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
insert ignore t1 values (1, repeat('a',210), repeat('b', 310));
Warnings:
Warning	1265	Data truncated for column 'a' at row 1
insert ignore t1 values (2, repeat(0xD0B1,215), repeat(0xD0B1, 310));
Warnings:
Warning	1265	Data truncated for column 'a' at row 1
select i, length(a), length(b), char_length(a), char_length(b) from t1;
i	length(a)	length(b)	char_length(a)	char_length(b)
1	200	310	200	310
2	400	620	200	310
select i from t1 where a=repeat(_utf8 'a',200);
i
1
Warnings:
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
select i from t1 where a=repeat(_utf8 0xD0B1,200);
i
2
Warnings:
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
select i from t1 where b=repeat(_utf8 'b',310);
i
1
Warnings:
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
drop table t1;
CREATE TABLE t1 (id int unsigned auto_increment, name char(50), primary key (id)) engine=myisam;
insert into t1 (name) values ('a'), ('b'),('c'),('d'),('e'),('f'),('g');
explain select 1 from t1 where id =2;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	const	PRIMARY	PRIMARY	4	const	1	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select 1 AS `1` from `test`.`t1` where true
explain select 1 from t1 where id =2 or id=3;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	range	PRIMARY	PRIMARY	4	NULL	2	100.00	Using where; Using index
Warnings:
Note	1003	/* select#1 */ select 1 AS `1` from `test`.`t1` where ((`test`.`t1`.`id` = 2) or (`test`.`t1`.`id` = 3))
explain select name from t1 where id =2;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	const	PRIMARY	PRIMARY	4	const	1	100.00	NULL
Warnings:
Note	1003	/* select#1 */ select 'b' AS `name` from `test`.`t1` where true
ALTER TABLE t1 DROP PRIMARY KEY, ADD INDEX (id);
explain select 1 from t1 where id =2;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	ref	id	id	4	const	1	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select 1 AS `1` from `test`.`t1` where (`test`.`t1`.`id` = 2)
drop table t1;
CREATE TABLE t1 (numeropost mediumint(8) unsigned NOT NULL default '0', numreponse int(10) unsigned NOT NULL auto_increment, PRIMARY KEY (numeropost,numreponse), UNIQUE KEY numreponse (numreponse));
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1681	Integer display width is deprecated and will be removed in a future release.
INSERT INTO t1 (numeropost,numreponse) VALUES ('1','1'),('1','2'),('2','3'),('2','4');
SELECT numeropost FROM t1 WHERE numreponse='1';
numeropost
1
EXPLAIN SELECT numeropost FROM t1 WHERE numreponse='1';
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	const	numreponse	numreponse	4	const	1	100.00	Using index
Warnings:
Note	1003	/* select#1 */ select '1' AS `numeropost` from `test`.`t1` where true
FLUSH TABLES;
SELECT numeropost FROM t1 WHERE numreponse='1';
numeropost
1
drop table t1;
create table t1 (c varchar(30), t text, unique (c(2)), unique (t(3))) charset utf8 engine=myisam;
Warnings:
Warning	3719	'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. Please consider using UTF8MB4 in order to be unambiguous.
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c` varchar(30) DEFAULT NULL,
  `t` text,
  UNIQUE KEY `c` (`c`(2)),
  UNIQUE KEY `t` (`t`(3))
) ENGINE=MyISAM DEFAULT CHARSET=utf8
insert t1 values ('cccc', 'tttt'),
(0xD0B1212223D0B1D0B1D0B1D0B1D0B1, 0xD0B1D0B1212223D0B1D0B1D0B1D0B1),
(0xD0B1222123D0B1D0B1D0B1D0B1D0B1, 0xD0B1D0B1222123D0B1D0B1D0B1D0B1);
insert t1 (c) values ('cc22');
ERROR 23000: Duplicate entry 'cc' for key 'c'
insert t1 (t) values ('ttt22');
ERROR 23000: Duplicate entry 'ttt' for key 't'
insert t1 (c) values (0xD0B1212322D0B1D0B1D0B1D0B1D0B1);
ERROR 23000: Duplicate entry 'б!' for key 'c'
insert t1 (t) values (0xD0B1D0B1212322D0B1D0B1D0B1D0B1);
ERROR 23000: Duplicate entry 'бб!' for key 't'
select c from t1 where c='cccc';
c
cccc
select t from t1 where t='tttt';
t
tttt
select c from t1 where c=0xD0B1212223D0B1D0B1D0B1D0B1D0B1;
c
б!"#ббббб
select t from t1 where t=0xD0B1D0B1212223D0B1D0B1D0B1D0B1;
t
бб!"#бббб
drop table t1;
DROP TABLE IF EXISTS t1;
Warnings:
Note	1051	Unknown table 'test.t1'
CREATE TABLE t1 (
c1 int,
c2 varbinary(240),
UNIQUE KEY (c1),
KEY (c2)
) ENGINE=MyISAM;
INSERT INTO t1 VALUES (1,'\Z\Z\Z\Z');
INSERT INTO t1 VALUES (2,'\Z\Z\Z\Z\Z\Z');
INSERT INTO t1 VALUES (3,'\Z\Z\Z\Z');
select c1 from t1 where c2='\Z\Z\Z\Z';
c1
1
3
DELETE FROM t1 WHERE (c1 = 1);
check table t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
select c1 from t1 where c2='\Z\Z\Z\Z';
c1
3
DELETE FROM t1 WHERE (c1 = 3);
check table t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
select c1 from t1 where c2='\Z\Z\Z\Z';
c1
truncate table t1;
insert into t1 values(1,"aaaa"),(2,"aaab"),(3,"aaac"),(4,"aaccc");
delete from t1 where c1=3;
delete from t1 where c1=1;
delete from t1 where c1=4;
check table t1;
Table	Op	Msg_type	Msg_text
test.t1	check	status	OK
drop table t1;
create table t1 (c char(10), index (c(0)));
ERROR HY000: Key part 'c' length cannot be 0
create table t1 (c char(10), index (c,c));
ERROR 42S21: Duplicate column name 'c'
create table t1 (c1 char(10), c2 char(10), index (c1,c2,c1));
ERROR 42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10), index (c1,c1,c2));
ERROR 42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10), index (c2,c1,c1));
ERROR 42S21: Duplicate column name 'c1'
create table t1 (c1 char(10), c2 char(10));
alter table t1 add key (c1,c1);
ERROR 42S21: Duplicate column name 'c1'
alter table t1 add key (c2,c1,c1);
ERROR 42S21: Duplicate column name 'c1'
alter table t1 add key (c1,c2,c1);
ERROR 42S21: Duplicate column name 'c1'
alter table t1 add key (c1,c1,c2);
ERROR 42S21: Duplicate column name 'c1'
drop table t1;
create table t1 (
i1 INT NOT NULL,
i2 INT NOT NULL,
UNIQUE i1idx (i1),
UNIQUE i2idx (i2)) charset utf8mb4;
desc t1;
Field	Type	Null	Key	Default	Extra
i1	int(11)	NO	PRI	NULL	
i2	int(11)	NO	UNI	NULL	
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `i1` int(11) NOT NULL,
  `i2` int(11) NOT NULL,
  UNIQUE KEY `i1idx` (`i1`),
  UNIQUE KEY `i2idx` (`i2`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
drop table t1;
create table t1 (
c1 int,
c2 varchar(20) not null,
primary key (c1),
key (c2(10))
) engine=myisam;
insert into t1 values (1,'');
insert into t1 values (2,' \t\tTest String');
insert into t1 values (3,' \n\tTest String');
update t1 set c2 = 'New Test String' where c1 = 1;
select * from t1;
c1	c2
1	New Test String
2	 		Test String
3	 
	Test String
drop table t1;
create table t1 (a varchar(10), b varchar(10), key(a(10),b(10))) charset utf8mb4;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` varchar(10) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `b` varchar(10) COLLATE utf8mb4_general_ci DEFAULT NULL,
  KEY `a` (`a`,`b`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
alter table t1 modify b varchar(20);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` varchar(10) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `b` varchar(20) COLLATE utf8mb4_general_ci DEFAULT NULL,
  KEY `a` (`a`,`b`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
alter table t1 modify a varchar(20);
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` varchar(20) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `b` varchar(20) COLLATE utf8mb4_general_ci DEFAULT NULL,
  KEY `a` (`a`,`b`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
drop table t1;
create table t1 (a int not null primary key, b varchar(20) not null unique);
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	PRI	NULL	
b	varchar(20)	NO	UNI	NULL	
drop table t1;
create table t1 (a int not null primary key, b int not null unique);
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	PRI	NULL	
b	int(11)	NO	UNI	NULL	
drop table t1;
create table t1 (a int not null primary key, b varchar(20) not null, unique (b(10)));
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	PRI	NULL	
b	varchar(20)	NO	UNI	NULL	
drop table t1;
create table t1 (a int not null primary key, b varchar(20) not null, c varchar(20) not null, unique(b(10),c(10)));
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	PRI	NULL	
b	varchar(20)	NO	MUL	NULL	
c	varchar(20)	NO		NULL	
drop table t1;
create table t1 (
c1 int,
c2 char(12),
c3 varchar(123),
c4 timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
index (c1),
index i1 (c1),
index i2 (c2),
index i3 (c3),
unique i4 (c4),
index i5 (c1, c2, c3, c4),
primary key (c2, c3),
index (c2, c4)) charset utf8mb4;
Warnings:
Warning	1831	Duplicate index 'i1' defined on the table 'test.t1'. This is deprecated and will be disallowed in a future release.
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) DEFAULT NULL,
  `c2` char(12) COLLATE utf8mb4_general_ci NOT NULL,
  `c3` varchar(123) COLLATE utf8mb4_general_ci NOT NULL,
  `c4` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`c2`,`c3`),
  UNIQUE KEY `i4` (`c4`),
  KEY `c1` (`c1`),
  KEY `i1` (`c1`),
  KEY `i2` (`c2`),
  KEY `i3` (`c3`),
  KEY `i5` (`c1`,`c2`,`c3`,`c4`),
  KEY `c2` (`c2`,`c4`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
alter table t1 drop index c1;
alter table t1 add index (c1);
Warnings:
Warning	1831	Duplicate index 'c1' defined on the table 'test.t1'. This is deprecated and will be disallowed in a future release.
alter table t1 add index (c1);
Warnings:
Warning	1831	Duplicate index 'c1_2' defined on the table 'test.t1'. This is deprecated and will be disallowed in a future release.
alter table t1 drop index i3;
alter table t1 add index i3 (c3);
alter table t1 drop index i2, drop index i4;
alter table t1 add index i2 (c2), add index i4 (c4);
alter table t1 drop index i2, drop index i4, add index i6 (c2, c4);
Warnings:
Warning	1831	Duplicate index 'i6' defined on the table 'test.t1'. This is deprecated and will be disallowed in a future release.
alter table t1 add index i2 (c2), add index i4 (c4), drop index i6;
alter table t1 drop index i2, drop index i4, add unique i4 (c4);
alter table t1 add index i2 (c2), drop index i4, add index i4 (c4);
alter table t1 drop index c2, add index (c2(4),c3(7));
alter table t1 drop index c2, add index (c2(4),c3(7));
alter table t1 add primary key (c1, c2), drop primary key;
alter table t1 drop primary key;
alter table t1 add primary key (c1, c2), drop primary key;
ERROR 42000: Can't DROP 'PRIMARY'; check that column/key exists
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `c1` int(11) NOT NULL,
  `c2` char(12) COLLATE utf8mb4_general_ci NOT NULL,
  `c3` varchar(123) COLLATE utf8mb4_general_ci NOT NULL,
  `c4` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  KEY `i1` (`c1`),
  KEY `i5` (`c1`,`c2`,`c3`,`c4`),
  KEY `c1` (`c1`),
  KEY `c1_2` (`c1`),
  KEY `i3` (`c3`),
  KEY `i2` (`c2`),
  KEY `i4` (`c4`),
  KEY `c2` (`c2`(4),`c3`(7))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
insert into t1 values(1, 'a', 'a', NOW()), (1, 'b', 'b', NOW());
alter table t1 drop index i3, drop index i2, drop index i1;
alter table t1 add index i3 (c3), add index i2 (c2), add unique index i1 (c1);
ERROR 23000: Duplicate entry '1' for key 'i1'
drop table t1;
CREATE TABLE t1( a TINYINT, KEY(a) ) ENGINE=MyISAM;
INSERT INTO t1 VALUES( 1 );
ALTER TABLE t1 DISABLE KEYS;
EXPLAIN SELECT MAX(a) FROM t1 FORCE INDEX(a);
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	system	NULL	NULL	NULL	NULL	1	100.00	NULL
Warnings:
Note	1003	/* select#1 */ select max('1') AS `MAX(a)` from dual
drop table t1;
CREATE TABLE t1 (
a INTEGER auto_increment PRIMARY KEY,
b INTEGER NOT NULL,
c INTEGER NOT NULL,
d CHAR(64)
);
CREATE TABLE t2 (
a INTEGER auto_increment PRIMARY KEY,
b INTEGER NOT NULL,
c SMALLINT NOT NULL,
d DATETIME NOT NULL,
e SMALLINT NOT NULL,
f INTEGER NOT NULL,
g INTEGER NOT NULL,  
h SMALLINT NOT NULL,
i INTEGER NOT NULL,
j INTEGER NOT NULL,
UNIQUE INDEX (b),
INDEX (b, d, e, f, g, h, i, j, c),
INDEX (c)
);
INSERT INTO t2 VALUES 
(NULL, 1, 254, '1000-01-01 00:00:00', 257, 0, 0, 0, 0, 0),
(NULL, 2, 1, '2004-11-30 12:00:00', 1, 0, 0, 0, 0, 0),
(NULL, 3, 1, '2004-11-30 12:00:00', 1, 0, 0, 2, -21600, 0),
(NULL, 4, 1, '2004-11-30 12:00:00', 1, 0, 0, 2, -10800, 0),
(NULL, 5, 1, '2004-11-30 12:00:00', 1, 0, 0, 5, -10800, 0),
(NULL, 6, 1, '2004-11-30 12:00:00', 102, 0, 0, 0, 0, 0),
(NULL, 7, 1, '2004-11-30 12:00:00', 105, 2, 0, 0, 0, 0),
(NULL, 8, 1, '2004-11-30 12:00:00', 105, 10, 0, 0, 0, 0);
INSERT INTO t1 (b, c, d) VALUES
(3388000, -553000, NULL),
(3388000, -553000, NULL);
DROP TABLE t1, t2;
create table t1(a int not null, key aa(a), 
b char(10) not null, unique key bb(b(1)), 
c char(4) not null, unique key cc(c)) charset utf8mb4;
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	MUL	NULL	
b	char(10)	NO	UNI	NULL	
c	char(4)	NO	PRI	NULL	
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` char(10) COLLATE utf8mb4_general_ci NOT NULL,
  `c` char(4) COLLATE utf8mb4_general_ci NOT NULL,
  UNIQUE KEY `cc` (`c`),
  UNIQUE KEY `bb` (`b`(1)),
  KEY `aa` (`a`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
drop table t1;
create table t1(a int not null, key aa(a), 
b char(10) not null, unique key bb(b(1)),
c char(4) not null) charset utf8mb4;
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	MUL	NULL	
b	char(10)	NO	UNI	NULL	
c	char(4)	NO		NULL	
alter table t1 add unique key cc(c);
desc t1;
Field	Type	Null	Key	Default	Extra
a	int(11)	NO	MUL	NULL	
b	char(10)	NO	UNI	NULL	
c	char(4)	NO	PRI	NULL	
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL,
  `b` char(10) COLLATE utf8mb4_general_ci NOT NULL,
  `c` char(4) COLLATE utf8mb4_general_ci NOT NULL,
  UNIQUE KEY `cc` (`c`),
  UNIQUE KEY `bb` (`b`(1)),
  KEY `aa` (`a`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
drop table t1;
End of 5.0 tests
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a INT PRIMARY KEY AUTO_INCREMENT);
INSERT INTO t1 VALUES (), (), ();
SELECT 1 AS c1
FROM t1
ORDER BY (
SELECT 1 AS c2
FROM t1
GROUP BY GREATEST(LAST_INSERT_ID(), t1.a)
ORDER BY GREATEST(LAST_INSERT_ID(), t1.a)
LIMIT 1);
c1
1
1
1
DROP TABLE t1;
CREATE TABLE t1 (a INT, b INT, INDEX (a,b)) engine=myisam;
INSERT INTO t1 (a, b)
VALUES
(1,1), (1,2), (1,3), (1,4), (1,5),
(2,2), (2,3), (2,1), (3,1), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6),
(5,1), (5,2), (5,3), (5,4), (5,5);
EXPLAIN SELECT 1 FROM t1 AS t1_outer WHERE 
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	PRIMARY	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	NULL	Impossible WHERE
2	SUBQUERY	t1	NULL	range	a	a	5	NULL	11	100.00	Using index for group-by
Warnings:
Note	1003	/* select#1 */ select 1 AS `1` from `test`.`t1` `t1_outer` where false
SELECT 1 as RES FROM t1 AS t1_outer WHERE 
(SELECT max(b) FROM t1 GROUP BY a HAVING a < 2) > 12;
RES
DROP TABLE t1;
#
# Bug#18144: Cost with FORCE/USE index seems incorrect in some cases.
#
# We are interested in showing that the cost for the last plan is higher
# than for the preceding two plans.
#
CREATE TABLE t1( a INT, b INT, KEY( a ) ) engine=myisam;
INSERT INTO t1 values (1, 2), (1, 3), (2, 3), (2, 4), (3, 4), (3, 5);
EXPLAIN SELECT a, SUM( b ) FROM t1 GROUP BY a;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	index	a	a	5	NULL	6	100.00	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,sum(`test`.`t1`.`b`) AS `SUM( b )` from `test`.`t1` group by `test`.`t1`.`a`
SHOW STATUS LIKE 'Last_query_cost';
Variable_name	Value
Last_query_cost	1.102296
EXPLAIN SELECT a, SUM( b ) FROM t1 USE INDEX( a ) GROUP BY a;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	index	a	a	5	NULL	6	100.00	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,sum(`test`.`t1`.`b`) AS `SUM( b )` from `test`.`t1` USE INDEX (`a`) group by `test`.`t1`.`a`
SHOW STATUS LIKE 'Last_query_cost';
Variable_name	Value
Last_query_cost	1.102296
EXPLAIN SELECT a, SUM( b ) FROM t1 FORCE INDEX( a ) GROUP BY a;
id	select_type	table	partitions	type	possible_keys	key	key_len	ref	rows	filtered	Extra
1	SIMPLE	t1	NULL	index	a	a	5	NULL	6	100.00	NULL
Warnings:
Note	1003	/* select#1 */ select `test`.`t1`.`a` AS `a`,sum(`test`.`t1`.`b`) AS `SUM( b )` from `test`.`t1` FORCE INDEX (`a`) group by `test`.`t1`.`a`
SHOW STATUS LIKE 'Last_query_cost';
Variable_name	Value
Last_query_cost	2.349000
DROP TABLE t1;
#
# Additional coverage for handling of key algorithm in index definition.
#
#
# 1) Default case. If key algorithm was not specified explicitly and
#    this is normal key (not spatial or fulltext) storage engine
#    default key algorithm is used.
#    
create table tm (k int, index (k)) charset utf8mb4 engine=myisam;
create table ti (k int, index (k)) charset utf8mb4 engine=XENGINE;
create table th (k int, index (k)) charset utf8mb4 engine=heap;
#
# Key algorithm is not shown in SHOW CREATE TABLE output in this case
#
show create table tm;
Table	Create Table
tm	CREATE TABLE `tm` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table ti;
Table	Create Table
ti	CREATE TABLE `ti` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
show create table th;
Table	Create Table
th	CREATE TABLE `th` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
#
# But visible in I_S.STATISTICS
#
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' order by table_name;
TABLE_NAME	INDEX_TYPE
th	HASH
ti	SE_SPECIFIC
tm	BTREE
#
# Same applies when keys are added by ALTER TABLE
#
alter table tm add column l int, add index (l);
alter table ti add column l int, add index (l);
alter table th add column l int, add index (l);
show create table tm;
Table	Create Table
tm	CREATE TABLE `tm` (
  `k` int(11) DEFAULT NULL,
  `l` int(11) DEFAULT NULL,
  KEY `k` (`k`),
  KEY `l` (`l`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table ti;
Table	Create Table
ti	CREATE TABLE `ti` (
  `k` int(11) DEFAULT NULL,
  `l` int(11) DEFAULT NULL,
  KEY `k` (`k`),
  KEY `l` (`l`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
show create table th;
Table	Create Table
th	CREATE TABLE `th` (
  `k` int(11) DEFAULT NULL,
  `l` int(11) DEFAULT NULL,
  KEY `k` (`k`),
  KEY `l` (`l`)
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'l'
  order by table_name;
TABLE_NAME	INDEX_TYPE
th	HASH
ti	SE_SPECIFIC
tm	BTREE
drop tables tm, ti, th;
#
# 2) For SPATIAL and FULLTEXT keys we always use special key
#    algorithms and there is no way to specify it explicitly.
#
create table tm (pk int primary key, p point not null SRID 0, spatial index (p))
charset utf8mb4 engine=myisam;
create table ti (pk int primary key, p point not null SRID 0, spatial index (p))
charset utf8mb4 engine=innodb;
create table th (pk int primary key, p point not null, spatial index (p))
charset utf8mb4 engine=heap;
ERROR 42000: The storage engine for the table doesn't support GEOMETRY
#
# Key algorithm is not shown in SHOW CREATE TABLE output in this
# case as well.
#
show create table tm;
Table	Create Table
tm	CREATE TABLE `tm` (
  `pk` int(11) NOT NULL,
  `p` point NOT NULL /*!80003 SRID 0 */,
  PRIMARY KEY (`pk`),
  SPATIAL KEY `p` (`p`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table ti;
Table	Create Table
ti	CREATE TABLE `ti` (
  `pk` int(11) NOT NULL,
  `p` point NOT NULL /*!80003 SRID 0 */,
  PRIMARY KEY (`pk`),
  SPATIAL KEY `p` (`p`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
#
# But visible in I_S.STATISTICS
#
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'p'
  order by table_name;
TABLE_NAME	INDEX_TYPE
ti	SPATIAL
tm	SPATIAL
#
# Same applies when keys are added by ALTER TABLE
#
alter table tm add column q point not null SRID 0, add spatial index (q);
alter table ti add column q point not null SRID 0, add spatial index (q);
show create table tm;
Table	Create Table
tm	CREATE TABLE `tm` (
  `pk` int(11) NOT NULL,
  `p` point NOT NULL /*!80003 SRID 0 */,
  `q` point NOT NULL /*!80003 SRID 0 */,
  PRIMARY KEY (`pk`),
  SPATIAL KEY `p` (`p`),
  SPATIAL KEY `q` (`q`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table ti;
Table	Create Table
ti	CREATE TABLE `ti` (
  `pk` int(11) NOT NULL,
  `p` point NOT NULL /*!80003 SRID 0 */,
  `q` point NOT NULL /*!80003 SRID 0 */,
  PRIMARY KEY (`pk`),
  SPATIAL KEY `p` (`p`),
  SPATIAL KEY `q` (`q`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'q'
  order by table_name;
TABLE_NAME	INDEX_TYPE
ti	SPATIAL
tm	SPATIAL
drop tables tm, ti;
#
# Same applies to FULLTEXT indexes.
#
create table tm (pk int primary key, v varchar(255), fulltext index (v))
charset utf8mb4 engine=myisam;
create table ti (pk int primary key, v varchar(255), fulltext index (v))
charset utf8mb4 engine=innodb;
create table th (pk int primary key, v varchar(255), fulltext index (v))
charset utf8mb4 engine=heap;
ERROR HY000: The used table type doesn't support FULLTEXT indexes
show create table tm;
Table	Create Table
tm	CREATE TABLE `tm` (
  `pk` int(11) NOT NULL,
  `v` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`pk`),
  FULLTEXT KEY `v` (`v`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table ti;
Table	Create Table
ti	CREATE TABLE `ti` (
  `pk` int(11) NOT NULL,
  `v` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`pk`),
  FULLTEXT KEY `v` (`v`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'v'
  order by table_name;
TABLE_NAME	INDEX_TYPE
ti	FULLTEXT
tm	FULLTEXT
#
# Same applies when keys are added by ALTER TABLE
#
alter table tm add column w varchar(255), add fulltext index (w);
alter table ti add column w varchar(255), add fulltext index (w);
show create table tm;
Table	Create Table
tm	CREATE TABLE `tm` (
  `pk` int(11) NOT NULL,
  `v` varchar(255) DEFAULT NULL,
  `w` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`pk`),
  FULLTEXT KEY `v` (`v`),
  FULLTEXT KEY `w` (`w`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table ti;
Table	Create Table
ti	CREATE TABLE `ti` (
  `pk` int(11) NOT NULL,
  `v` varchar(255) DEFAULT NULL,
  `w` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`pk`),
  FULLTEXT KEY `v` (`v`),
  FULLTEXT KEY `w` (`w`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'w'
  order by table_name;
TABLE_NAME	INDEX_TYPE
ti	FULLTEXT
tm	FULLTEXT
drop tables tm, ti;
#
# 3) If key algorithm was specified explicitly and it is supported
#    by the storage engine it will be used.
#
create table tm (k int, index using btree (k)) charset utf8mb4 engine=myisam;
create table ti (k int, index using btree (k)) charset utf8mb4 engine=innodb;
create table th (k int, index using btree (k)) charset utf8mb4 engine=heap;
#
# In this case it is shown in SHOW CREATE TABLE output
#
show create table tm;
Table	Create Table
tm	CREATE TABLE `tm` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`) USING BTREE
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table ti;
Table	Create Table
ti	CREATE TABLE `ti` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table th;
Table	Create Table
th	CREATE TABLE `th` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`) USING BTREE
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
#
# Also visible in I_S.STATISTICS
#
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' order by table_name;
TABLE_NAME	INDEX_TYPE
th	BTREE
ti	BTREE
tm	BTREE
#
# Same applies when keys are added by ALTER TABLE
#
# Note that the information that algorithm was provided explicitly is
# preserved by ALTER TABLE.
alter table tm add column l int, add index using btree (l);
alter table ti add column l int, add index using btree (l);
alter table th add column l int, add index using hash (l);
show create table tm;
Table	Create Table
tm	CREATE TABLE `tm` (
  `k` int(11) DEFAULT NULL,
  `l` int(11) DEFAULT NULL,
  KEY `k` (`k`) USING BTREE,
  KEY `l` (`l`) USING BTREE
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table ti;
Table	Create Table
ti	CREATE TABLE `ti` (
  `k` int(11) DEFAULT NULL,
  `l` int(11) DEFAULT NULL,
  KEY `k` (`k`) USING BTREE,
  KEY `l` (`l`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table th;
Table	Create Table
th	CREATE TABLE `th` (
  `k` int(11) DEFAULT NULL,
  `l` int(11) DEFAULT NULL,
  KEY `k` (`k`) USING BTREE,
  KEY `l` (`l`) USING HASH
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'l'
  order by table_name;
TABLE_NAME	INDEX_TYPE
th	HASH
ti	BTREE
tm	BTREE
drop tables tm, ti, th;
#
# 4) If key algorithm was specified explicitly and but it is not
#    supported by the storage engine the default algorithm for SE
#    will be used instead. We will emit a note in this case. We will
#    also treat such situation as if algorithm is implicit. 
#
# The below statements should emit notes.
create table tm (k int, index using hash (k)) charset utf8mb4 engine=myisam;
Warnings:
Note	3502	This storage engine does not support the HASH index algorithm, storage engine default was used instead.
create table ti (k int, index using hash (k)) charset utf8mb4 engine=innodb;
Warnings:
Note	3502	This storage engine does not support the HASH index algorithm, storage engine default was used instead.
#
# In this case algorithm is not in SHOW CREATE TABLE output
#
show create table tm;
Table	Create Table
tm	CREATE TABLE `tm` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table ti;
Table	Create Table
ti	CREATE TABLE `ti` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
#
# But visible in I_S.STATISTICS
#
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' order by table_name;
TABLE_NAME	INDEX_TYPE
ti	BTREE
tm	BTREE
#
# Same applies when keys are added by ALTER TABLE
#
alter table tm add column l int, add index using hash (l);
Warnings:
Note	3502	This storage engine does not support the HASH index algorithm, storage engine default was used instead.
alter table ti add column l int, add index using hash (l);
Warnings:
Note	3502	This storage engine does not support the HASH index algorithm, storage engine default was used instead.
show create table tm;
Table	Create Table
tm	CREATE TABLE `tm` (
  `k` int(11) DEFAULT NULL,
  `l` int(11) DEFAULT NULL,
  KEY `k` (`k`),
  KEY `l` (`l`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
show create table ti;
Table	Create Table
ti	CREATE TABLE `ti` (
  `k` int(11) DEFAULT NULL,
  `l` int(11) DEFAULT NULL,
  KEY `k` (`k`),
  KEY `l` (`l`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'l'
  order by table_name;
TABLE_NAME	INDEX_TYPE
ti	BTREE
tm	BTREE
drop tables tm, ti;
#
# 5) Coverage for key algorithm handling in cross-engine ALTER TABLE.
#
# If algorithm was not specified explicitly cross-engine ALTER TABLE
# will silently change it to the new SE's default.
create table t1 (k int, index (k)) charset utf8mb4 engine=innodb;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'k'
  order by table_name;
TABLE_NAME	INDEX_TYPE
t1	BTREE
# Change table's SE.
alter table t1 engine= heap;
# Key definition stays the same in SHOW CREATE TABLE output
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
# But in I_S.STATISTICS we see that algorithm has changed.
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'k'
  order by table_name;
TABLE_NAME	INDEX_TYPE
t1	HASH
drop table t1;
#
# If algorithm was specified explicitly and is supported by the new
# SE we will keep it.
#
create table t1 (k int, index using btree (k)) charset utf8mb4 engine=innodb;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'k'
  order by table_name;
TABLE_NAME	INDEX_TYPE
t1	BTREE
# Change table's SE.
alter table t1 engine= heap;
# Key definition stays the same in SHOW CREATE TABLE output
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`) USING BTREE
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
# In I_S.STATISTICS we also see that algorithm is the same
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'k'
  order by table_name;
TABLE_NAME	INDEX_TYPE
t1	BTREE
drop table t1;
#
# If algorithm was specified explicitly but is not supported by the
# new SE, we will used new SE's default instead, emit a note, and
# treat new algorithm as implicitly specified after that.
#
create table t1 (k int, index using hash (k)) charset utf8mb4 engine=heap;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`) USING HASH
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'k'
  order by table_name;
TABLE_NAME	INDEX_TYPE
t1	HASH
# Change table's SE. Note will be emitted.
alter table t1 engine= innodb;
Warnings:
Note	3502	This storage engine does not support the HASH index algorithm, storage engine default was used instead.
# New algorithm is not visible SHOW CREATE TABLE output.
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
# In I_S.STATISTICS we see that algorithm has changed.
select table_name, index_type from information_schema.statistics
where table_schema = 'test' and table_name like 't%' and index_name = 'k'
  order by table_name;
TABLE_NAME	INDEX_TYPE
t1	BTREE
drop table t1;
#
# 6) Key algorithms and duplicate key detection.
#
# When we detect duplicate keys in table definition we take
# key algorithm into account. But we ignore if it was explicit
# or implicit.
create table t1 (k int, index using btree (k), index using hash (k)) engine=heap;
drop table t1;
create table t1 (k int, index (k), index using hash (k)) engine=heap;
Warnings:
Warning	1831	Duplicate index 'k_2' defined on the table 'test.t1'. This is deprecated and will be disallowed in a future release.
drop table t1;
create table t1 (k int, index using btree (k), index (k)) engine=innodb;
Warnings:
Warning	1831	Duplicate index 'k_2' defined on the table 'test.t1'. This is deprecated and will be disallowed in a future release.
drop table t1;
create table t1 (k int, index using btree (k), index using hash (k)) engine=innodb;
Warnings:
Note	3502	This storage engine does not support the HASH index algorithm, storage engine default was used instead.
Warning	1831	Duplicate index 'k_2' defined on the table 'test.t1'. This is deprecated and will be disallowed in a future release.
drop table t1;
#
# 7) Key algorithm and ALTER TABLE ALGORITHM=INPLACE
#
# Changing key algorithm from one used by default to the same one
# but specified explicitly should be inplace/fast operation.
create table t1 (k int, index (k)) charset utf8mb4 engine=myisam;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
alter table t1 drop key k, add index using btree (k), algorithm=inplace;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`) USING BTREE
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
alter table t1 drop key k, add index (k), algorithm=inplace;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
# Note that below statement doesn't really change algorithm.
alter table t1 drop key k, add index using hash (k), algorithm=inplace;
Warnings:
Note	3502	This storage engine does not support the HASH index algorithm, storage engine default was used instead.
drop table t1;
# Changing key algorithm to another one can require COPY algorithm.
create table t1 (k int, index (k)) charset utf8mb4 engine=heap;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
alter table t1 drop key k, add index using btree (k), algorithm=inplace;
ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY.
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`)
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
alter table t1 drop key k, add index using btree (k), algorithm=copy;
show create table t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `k` int(11) DEFAULT NULL,
  KEY `k` (`k`) USING BTREE
) ENGINE=MEMORY DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci
drop table t1;
#
# Bug #27546306 MISSING VITAL ERROR INFORMATION IN ERROR MESSAGE WHEN FAILING TO CONVERT CHARSET
#
#
CREATE TABLE `mytable` (   `id` INT(10) UNSIGNED NOT NULL DEFAULT '0',   `somefield` VARCHAR(1000) NOT NULL DEFAULT '',
PRIMARY KEY (`id`,`somefield`) )
DEFAULT CHARSET=UTF8MB3;
Warnings:
Warning	1681	Integer display width is deprecated and will be removed in a future release.
Warning	1287	'utf8mb3' is deprecated and will be removed in a future release. Please use utf8mb4 instead
ALTER TABLE mytable CONVERT TO CHARACTER SET UTF8MB4;
ERROR HY000: Could not change column 'somefield' of table 'mytable'. The resulting size of index 'PRIMARY' would exceed the max key length of 3072 bytes.
DROP TABLE mytable;
#
# Bug 25647413 "ASSERTION FAILURE: HA_INNODB.CC:NNN:(TABLE->INDEXES).
#               COUNT == DD_TABLE.INDEXES()".
#
create table t1 (b text not null, unique key(b(8)));
drop table t1;