show variables like 'xengine_disable_online_ddl';
Variable_name	Value
xengine_disable_online_ddl	0
set @xengine_disable_online_ddl_saved = @@xengine_disable_online_ddl;
set xengine_disable_online_ddl = 1;
ERROR HY000: Variable 'xengine_disable_online_ddl' is a GLOBAL variable and should be set with SET GLOBAL
set global xengine_disable_online_ddl = 1;
##############
### basic mixture tests of INSTANT/INPLACE/COPY DDL
##############
# CREATE TABLE
#######
CREATE TABLE t1(
id INT NOT NULL, col_to_drop INT,
c1 INT DEFAULT 1, c2 VARCHAR(70),
col_to_extend VARCHAR(70),
c3 INT NOT NULL, c4 INT NULL,
chk_col INT, k1_col INT, k2_col INT,
UNIQUE KEY k1(k1_col),
KEY k2(k2_col),
KEY vis_key(c1) VISIBLE,
KEY inv_key(c2) INVISIBLE,
CONSTRAINT old_chk1 CHECK(chk_col < 100),
CONSTRAINT old_chk2 CHECK(chk_col > 10),
PRIMARY KEY(col_to_drop)
) ENGINE=XENGINE;
INSERT INTO t1 VALUES(1, 1, 2, 'aa', 'abc', 2, 2, 20, 2, 1);
INSERT INTO t1 VALUES(2, 2, 4, 'bb', 'cde', 4, 4, 40, 4, 1);
#######
# INSTANT DDL
#######
ALTER TABLE t1
ADD COLUMN (app_col TEXT, app_col1 INT),
ALTER c1 DROP DEFAULT,
ALTER c2 SET DEFAULT 'aaaa',
RENAME TO tt,
ALGORITHM = INSTANT;
SHOW CREATE TABLE tt;
Table	Create Table
tt	CREATE TABLE `tt` (
  `id` int(11) NOT NULL,
  `col_to_drop` int(11) NOT NULL,
  `c1` int(11),
  `c2` varchar(70) COLLATE utf8mb4_general_ci DEFAULT 'aaaa',
  `col_to_extend` varchar(70) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c3` int(11) NOT NULL,
  `c4` int(11) DEFAULT NULL,
  `chk_col` int(11) DEFAULT NULL,
  `k1_col` int(11) DEFAULT NULL,
  `k2_col` int(11) DEFAULT NULL,
  `app_col` text COLLATE utf8mb4_general_ci,
  `app_col1` int(11) DEFAULT NULL,
  PRIMARY KEY (`col_to_drop`),
  UNIQUE KEY `k1` (`k1_col`),
  KEY `k2` (`k2_col`),
  KEY `vis_key` (`c1`),
  KEY `inv_key` (`c2`) /*!80000 INVISIBLE */,
  CONSTRAINT `old_chk1` CHECK ((`chk_col` < 100)),
  CONSTRAINT `old_chk2` CHECK ((`chk_col` > 10))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
#######
# Inplace without rebuild
#######
ALTER TABLE tt
ALTER INDEX vis_key INVISIBLE,
ALTER INDEX inv_key VISIBLE,
ALGORITHM = INPLACE;
ALTER TABLE tt
DROP KEY k1,
DROP KEY k2,
ADD INDEX key1(c4) COMMENT 'secondary key1',
ADD UNIQUE INDEX key2(c3) COMMENT 'unique secondary key2',
MODIFY COLUMN col_to_extend VARCHAR(100),
RENAME COLUMN col_to_drop to col_to_drop_later,
RENAME INDEX vis_key TO iv_key,
RENAME INDEX inv_key TO v_key,
ALGORITHM = INPLACE;
SHOW CREATE TABLE tt;
Table	Create Table
tt	CREATE TABLE `tt` (
  `id` int(11) NOT NULL,
  `col_to_drop_later` int(11) NOT NULL,
  `c1` int(11),
  `c2` varchar(70) COLLATE utf8mb4_general_ci DEFAULT 'aaaa',
  `col_to_extend` varchar(100) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c3` int(11) NOT NULL,
  `c4` int(11) DEFAULT NULL,
  `chk_col` int(11) DEFAULT NULL,
  `k1_col` int(11) DEFAULT NULL,
  `k2_col` int(11) DEFAULT NULL,
  `app_col` text COLLATE utf8mb4_general_ci,
  `app_col1` int(11) DEFAULT NULL,
  PRIMARY KEY (`col_to_drop_later`),
  UNIQUE KEY `key2` (`c3`) COMMENT 'unique secondary key2',
  KEY `iv_key` (`c1`) /*!80000 INVISIBLE */,
  KEY `v_key` (`c2`),
  KEY `key1` (`c4`) COMMENT 'secondary key1',
  CONSTRAINT `old_chk1` CHECK ((`chk_col` < 100)),
  CONSTRAINT `old_chk2` CHECK ((`chk_col` > 10))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
#######
# Inplace DDL with rebuild, aka. online copy ddl
#######
ALTER TABLE tt
DROP PRIMARY KEY,
ADD PRIMARY KEY(id),
DROP COLUMN col_to_drop_later,
ADD COLUMN email VARCHAR(32) AFTER c2,
MODIFY COLUMN c3 INT AFTER c4,
ALGORITHM = INPLACE;
ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY.
SHOW CREATE TABLE tt;
Table	Create Table
tt	CREATE TABLE `tt` (
  `id` int(11) NOT NULL,
  `col_to_drop_later` int(11) NOT NULL,
  `c1` int(11),
  `c2` varchar(70) COLLATE utf8mb4_general_ci DEFAULT 'aaaa',
  `col_to_extend` varchar(100) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c3` int(11) NOT NULL,
  `c4` int(11) DEFAULT NULL,
  `chk_col` int(11) DEFAULT NULL,
  `k1_col` int(11) DEFAULT NULL,
  `k2_col` int(11) DEFAULT NULL,
  `app_col` text COLLATE utf8mb4_general_ci,
  `app_col1` int(11) DEFAULT NULL,
  PRIMARY KEY (`col_to_drop_later`),
  UNIQUE KEY `key2` (`c3`) COMMENT 'unique secondary key2',
  KEY `iv_key` (`c1`) /*!80000 INVISIBLE */,
  KEY `v_key` (`c2`),
  KEY `key1` (`c4`) COMMENT 'secondary key1',
  CONSTRAINT `old_chk1` CHECK ((`chk_col` < 100)),
  CONSTRAINT `old_chk2` CHECK ((`chk_col` > 10))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
SELECT * FROM tt;
id	col_to_drop_later	c1	c2	col_to_extend	c3	c4	chk_col	k1_col	k2_col	app_col	app_col1
1	1	2	aa	abc	2	2	20	2	1	NULL	NULL
2	2	4	bb	cde	4	4	40	4	1	NULL	NULL
DROP TABLE tt;
set global xengine_disable_online_ddl = 2;
CREATE TABLE t1(
id INT NOT NULL, col_to_drop INT,
c1 INT DEFAULT 1, c2 VARCHAR(70),
col_to_extend VARCHAR(70),
c3 INT NOT NULL, c4 INT NULL,
chk_col INT, k1_col INT, k2_col INT,
UNIQUE KEY k1(k1_col),
KEY k2(k2_col),
KEY vis_key(c1) VISIBLE,
KEY inv_key(c2) INVISIBLE,
CONSTRAINT old_chk1 CHECK(chk_col < 100),
CONSTRAINT old_chk2 CHECK(chk_col > 10),
PRIMARY KEY(col_to_drop)
) ENGINE=XENGINE;
INSERT INTO t1 VALUES(1, 1, 2, 'aa', 'abc', 2, 2, 20, 2, 1);
INSERT INTO t1 VALUES(2, 2, 4, 'bb', 'cde', 4, 4, 40, 4, 1);
#######
# INSTANT DDL
#######
ALTER TABLE t1
ADD COLUMN (app_col TEXT, app_col1 INT),
ALTER c1 DROP DEFAULT,
ALTER c2 SET DEFAULT 'aaaa',
RENAME TO tt,
ALGORITHM = INSTANT;
SHOW CREATE TABLE tt;
Table	Create Table
tt	CREATE TABLE `tt` (
  `id` int(11) NOT NULL,
  `col_to_drop` int(11) NOT NULL,
  `c1` int(11),
  `c2` varchar(70) COLLATE utf8mb4_general_ci DEFAULT 'aaaa',
  `col_to_extend` varchar(70) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c3` int(11) NOT NULL,
  `c4` int(11) DEFAULT NULL,
  `chk_col` int(11) DEFAULT NULL,
  `k1_col` int(11) DEFAULT NULL,
  `k2_col` int(11) DEFAULT NULL,
  `app_col` text COLLATE utf8mb4_general_ci,
  `app_col1` int(11) DEFAULT NULL,
  PRIMARY KEY (`col_to_drop`),
  UNIQUE KEY `k1` (`k1_col`),
  KEY `k2` (`k2_col`),
  KEY `vis_key` (`c1`),
  KEY `inv_key` (`c2`) /*!80000 INVISIBLE */,
  CONSTRAINT `old_chk1` CHECK ((`chk_col` < 100)),
  CONSTRAINT `old_chk2` CHECK ((`chk_col` > 10))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
#######
# Inplace without rebuild
#######
ALTER TABLE tt
ALTER INDEX vis_key INVISIBLE,
ALTER INDEX inv_key VISIBLE,
ALGORITHM = INPLACE;
ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY.
ALTER TABLE tt
DROP KEY k1,
DROP KEY k2,
ADD INDEX key1(c4) COMMENT 'secondary key1',
ADD UNIQUE INDEX key2(c3) COMMENT 'unique secondary key2',
MODIFY COLUMN col_to_extend VARCHAR(100),
RENAME COLUMN col_to_drop to col_to_drop_later,
RENAME INDEX vis_key TO iv_key,
RENAME INDEX inv_key TO v_key,
ALGORITHM = INPLACE;
ERROR 0A000: ALGORITHM=INPLACE is not supported for this operation. Try ALGORITHM=COPY.
SHOW CREATE TABLE tt;
Table	Create Table
tt	CREATE TABLE `tt` (
  `id` int(11) NOT NULL,
  `col_to_drop` int(11) NOT NULL,
  `c1` int(11),
  `c2` varchar(70) COLLATE utf8mb4_general_ci DEFAULT 'aaaa',
  `col_to_extend` varchar(70) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c3` int(11) NOT NULL,
  `c4` int(11) DEFAULT NULL,
  `chk_col` int(11) DEFAULT NULL,
  `k1_col` int(11) DEFAULT NULL,
  `k2_col` int(11) DEFAULT NULL,
  `app_col` text COLLATE utf8mb4_general_ci,
  `app_col1` int(11) DEFAULT NULL,
  PRIMARY KEY (`col_to_drop`),
  UNIQUE KEY `k1` (`k1_col`),
  KEY `k2` (`k2_col`),
  KEY `vis_key` (`c1`),
  KEY `inv_key` (`c2`) /*!80000 INVISIBLE */,
  CONSTRAINT `old_chk1` CHECK ((`chk_col` < 100)),
  CONSTRAINT `old_chk2` CHECK ((`chk_col` > 10))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
ALTER TABLE tt
DROP KEY k1,
DROP KEY k2,
ADD INDEX key1(c4) COMMENT 'secondary key1',
ADD UNIQUE INDEX key2(c3) COMMENT 'unique secondary key2',
MODIFY COLUMN col_to_extend VARCHAR(100),
RENAME COLUMN col_to_drop to col_to_drop_later,
RENAME INDEX vis_key TO iv_key,
RENAME INDEX inv_key TO v_key,
ALGORITHM = COPY;
SHOW CREATE TABLE tt;
Table	Create Table
tt	CREATE TABLE `tt` (
  `id` int(11) NOT NULL,
  `col_to_drop_later` int(11) NOT NULL,
  `c1` int(11),
  `c2` varchar(70) COLLATE utf8mb4_general_ci DEFAULT 'aaaa',
  `col_to_extend` varchar(100) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c3` int(11) NOT NULL,
  `c4` int(11) DEFAULT NULL,
  `chk_col` int(11) DEFAULT NULL,
  `k1_col` int(11) DEFAULT NULL,
  `k2_col` int(11) DEFAULT NULL,
  `app_col` text COLLATE utf8mb4_general_ci,
  `app_col1` int(11) DEFAULT NULL,
  PRIMARY KEY (`col_to_drop_later`),
  UNIQUE KEY `key2` (`c3`) COMMENT 'unique secondary key2',
  KEY `iv_key` (`c1`),
  KEY `v_key` (`c2`) /*!80000 INVISIBLE */,
  KEY `key1` (`c4`) COMMENT 'secondary key1',
  CONSTRAINT `old_chk1` CHECK ((`chk_col` < 100)),
  CONSTRAINT `old_chk2` CHECK ((`chk_col` > 10))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
drop table tt;
########################################################################
case 1 INSTANT DDL + INPLACE DDL
########################################################################
CREATE TABLE t1(id INT PRIMARY KEY, c1 INT DEFAULT 1, c2 CHAR(10), KEY sk1(c2(6))) ENGINE=XENGINE;
INSERT INTO t1 VALUES(1, 1, 'aaaa'), (2, 2, 'bbbb');
ALTER TABLE t1 ADD COLUMN c3 VARCHAR(30), ALGORITHM=INSTANT;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id` int(11) NOT NULL,
  `c1` int(11) DEFAULT '1',
  `c2` char(10) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c3` varchar(30) COLLATE utf8mb4_general_ci DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `sk1` (`c2`(6))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
ALTER TABLE t1 ADD COLUMN c4 FLOAT, ADD UNIQUE KEY uk(c1), ADD KEY sk(c3), DROP KEY sk1, 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` (
  `id` int(11) NOT NULL,
  `c1` int(11) DEFAULT '1',
  `c2` char(10) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c3` varchar(30) COLLATE utf8mb4_general_ci DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `sk1` (`c2`(6))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
ALTER TABLE t1 ADD COLUMN c4 FLOAT, ADD UNIQUE KEY uk(c1), ADD KEY sk(c3), DROP KEY sk1, ALGORITHM=COPY;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id` int(11) NOT NULL,
  `c1` int(11) DEFAULT '1',
  `c2` char(10) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c3` varchar(30) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c4` float DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `uk` (`c1`),
  KEY `sk` (`c3`)
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
DROP TABLE t1;
########################################################################
case 2 INSTANT DDL + INPLACE REBUILD DDL
########################################################################
CREATE TABLE t1(id INT PRIMARY KEY, c1 INT DEFAULT 1, c2 CHAR(10), KEY sk1(c2(6))) ENGINE=XENGINE;
INSERT INTO t1 VALUES(1, 1, 'aaaa'), (2, 2, 'bbbb');
ALTER TABLE t1 ADD COLUMN c3 VARCHAR(30), ALGORITHM=INSTANT;
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `id` int(11) NOT NULL,
  `c1` int(11) DEFAULT '1',
  `c2` char(10) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c3` varchar(30) COLLATE utf8mb4_general_ci DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `sk1` (`c2`(6))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
ALTER TABLE t1 ADD COLUMN c4 FLOAT, DROP COLUMN c1, 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` (
  `id` int(11) NOT NULL,
  `c1` int(11) DEFAULT '1',
  `c2` char(10) COLLATE utf8mb4_general_ci DEFAULT NULL,
  `c3` varchar(30) COLLATE utf8mb4_general_ci DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `sk1` (`c2`(6))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
DROP TABLE t1;
########################################################################
case 3 INPLACE DDL + INPLACE REBUILD DDL
########################################################################
CREATE TABLE t1(id INT PRIMARY KEY, c1 INT DEFAULT 1, c2 CHAR(10), KEY sk1(c2(6))) ENGINE=XENGINE;
INSERT INTO t1 VALUES(1, 1, 'aaaa'), (2, 2, 'bbbb');
ALTER TABLE t1 DROP COLUMN c2, ADD UNIQUE KEY uk(c1), 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` (
  `id` int(11) NOT NULL,
  `c1` int(11) DEFAULT '1',
  `c2` char(10) COLLATE utf8mb4_general_ci DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `sk1` (`c2`(6))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
DROP TABLE t1;
########################################################################
case 4 INSTANT DDL + INPLACE DDL + INPLACE REBUILD DDL
########################################################################
CREATE TABLE t1(id INT PRIMARY KEY, c1 INT DEFAULT 1, c2 CHAR(10), KEY sk1(c2(6))) ENGINE=XENGINE;
INSERT INTO t1 VALUES(1, 1, 'aaaa'), (2, 2, 'bbbb');
ALTER TABLE t1 ADD COLUMN c3 FLOAT, ADD UNIQUE KEY uk(c1), DROP COLUMN c2, 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` (
  `id` int(11) NOT NULL,
  `c1` int(11) DEFAULT '1',
  `c2` char(10) COLLATE utf8mb4_general_ci DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `sk1` (`c2`(6))
) ENGINE=XENGINE DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci
DROP TABLE t1;
set global xengine_disable_online_ddl = @xengine_disable_online_ddl_saved;
show variables like 'xengine_disable_online_ddl';
Variable_name	Value
xengine_disable_online_ddl	0