drop table if exists t1;
CREATE TABLE t1 (a INT, b INT AUTO_INCREMENT, KEY ka(a), KEY kb(a,b), PRIMARY KEY(b)) ENGINE=xengine;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) DEFAULT NULL,
  `b` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`b`),
  KEY `ka` (`a`),
  KEY `kb` (`a`,`b`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
INSERT INTO t1 (a) VALUES (1);
INSERT INTO t1 (a) VALUES (3);
INSERT INTO t1 (a) VALUES (5);
ALTER TABLE t1 DROP INDEX ka, ALGORITHM=INPLACE;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) DEFAULT NULL,
  `b` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`b`),
  KEY `kb` (`a`,`b`)
) ENGINE=XENGINE AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
SELECT * FROM t1 FORCE INDEX(ka) where a > 1;
ERROR 42000: Key 'ka' doesn't exist in table 't1'
SELECT * FROM t1 FORCE INDEX(kb) where a > 1;
a	b
3	2
5	3
SELECT * FROM t1 where b > 1;
a	b
3	2
5	3
DROP TABLE t1;
CREATE TABLE t1 (a INT AUTO_INCREMENT, b INT, c INT, KEY kb(b), KEY kbc(b,c), KEY kc(c), PRIMARY KEY(a)) ENGINE=xengine;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL AUTO_INCREMENT,
  `b` int(11) DEFAULT NULL,
  `c` int(11) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `kb` (`b`),
  KEY `kbc` (`b`,`c`),
  KEY `kc` (`c`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
INSERT INTO t1 (b,c) VALUES (1,2);
INSERT INTO t1 (b,c) VALUES (3,4);
INSERT INTO t1 (b,c) VALUES (5,6);
ALTER TABLE t1 DROP INDEX kb, DROP INDEX kbc, ALGORITHM=INPLACE;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL AUTO_INCREMENT,
  `b` int(11) DEFAULT NULL,
  `c` int(11) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `kc` (`c`)
) ENGINE=XENGINE AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
# restart
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL AUTO_INCREMENT,
  `b` int(11) DEFAULT NULL,
  `c` int(11) DEFAULT NULL,
  PRIMARY KEY (`a`),
  KEY `kc` (`c`)
) ENGINE=XENGINE AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
INSERT INTO t1 (b,c) VALUES (1,2);
INSERT INTO t1 (b,c) VALUES (3,4);
INSERT INTO t1 (b,c) VALUES (5,6);
SELECT * FROM t1 FORCE INDEX(kc) where c > 3;
a	b	c
2	3	4
3	5	6
5	3	4
6	5	6
SELECT * FROM t1 where b > 3;
a	b	c
3	5	6
6	5	6
DROP TABLE t1;
CREATE TABLE t1 (a INT, b INT, c INT, KEY kb(b), KEY kbc(b,c), KEY kc(c), PRIMARY KEY(a)) ENGINE=xengine;
SHOW INDEX IN 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	a	A	0	NULL	NULL		SE_SPECIFIC			YES	NULL
t1	1	kb	1	b	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
t1	1	kbc	1	b	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
t1	1	kbc	2	c	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
t1	1	kc	1	c	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
ALTER TABLE t1 DROP INDEX kb, DROP INDEX kbc, ALGORITHM=INPLACE;
SHOW INDEX IN 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	a	A	0	NULL	NULL		SE_SPECIFIC			YES	NULL
t1	1	kc	1	c	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
ALTER TABLE t1 DROP PRIMARY KEY;
SHOW INDEX IN 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	1	kc	1	c	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
ALTER TABLE t1 DROP INDEX kc, ALGORITHM=INPLACE;
SHOW INDEX IN t1;
Table	Non_unique	Key_name	Seq_in_index	Column_name	Collation	Cardinality	Sub_part	Packed	Null	Index_type	Comment	Index_comment	Visible	Expression
DROP TABLE t1;
CREATE TABLE t1 (a INT AUTO_INCREMENT, b INT, c INT, PRIMARY KEY(a)) ENGINE=xengine;
ALTER TABLE t1 ADD UNIQUE INDEX kb(b);
ALTER TABLE t1 ADD UNIQUE INDEX kbc(b,c);
ALTER TABLE t1 ADD UNIQUE INDEX kc(c);
SHOW INDEX IN 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	a	A	0	NULL	NULL		SE_SPECIFIC			YES	NULL
t1	0	kb	1	b	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
t1	0	kbc	1	b	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
t1	0	kbc	2	c	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
t1	0	kc	1	c	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
ALTER TABLE t1 DROP INDEX kb, DROP INDEX kbc;
SHOW INDEX IN 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	a	A	0	NULL	NULL		SE_SPECIFIC			YES	NULL
t1	0	kc	1	c	A	0	NULL	NULL	YES	SE_SPECIFIC			YES	NULL
# restart
INSERT INTO t1 (b,c) VALUES (1,2);
INSERT INTO t1 (b,c) VALUES (3,4);
INSERT INTO t1 (b,c) VALUES (5,6);
SELECT * FROM t1 FORCE INDEX(kc) where c > 3;
a	b	c
2	3	4
3	5	6
ALTER TABLE t1 DROP INDEX kc, ALGORITHM=INPLACE;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` int(11) NOT NULL AUTO_INCREMENT,
  `b` int(11) DEFAULT NULL,
  `c` int(11) DEFAULT NULL,
  PRIMARY KEY (`a`)
) ENGINE=XENGINE AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
DROP TABLE t1;
CREATE TABLE IF NOT EXISTS t1 (col1 INT, col2 INT, col3 INT);
INSERT INTO t1 (col1,col2,col3) VALUES (1,2,3);
ALTER TABLE t1 ADD KEY idx ( col1, col2 );
ANALYZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
ALTER TABLE t1 DROP COLUMN col2;
ALTER TABLE t1 DROP COLUMN col3;
DROP TABLE t1;
CREATE TABLE IF NOT EXISTS t1 (col1 INT, col2 INT, col3 INT);
INSERT INTO t1 (col1,col2,col3) VALUES (1,2,3);
ALTER TABLE t1 ADD KEY idx ( col1, col2 );
ANALYZE TABLE t1;
Table	Op	Msg_type	Msg_text
test.t1	analyze	status	OK
ALTER TABLE t1 DROP COLUMN col2;
ALTER TABLE t1 DROP COLUMN col3;
DROP TABLE t1;