#
# sql_mode:    alter_algorithm: COPY
#
CREATE TABLE t1(f1 INT NOT NULL,
f2 INT NOT NULL,
f3 INT NULL,
f4 INT as (f2) STORED,
f5 INT as (f3) STORED,
PRIMARY KEY(f1))ROW_FORMAT=COMPRESSED, ENGINE=INNODB;
INSERT INTO t1(f1, f2, f3) VALUES(1, 1, 1);
# All the following cases needs table rebuild
# Add and Drop primary key
ALTER TABLE t1 ADD COLUMN col1 INT NOT NULL,DROP PRIMARY KEY,ADD PRIMARY KEY(col1), ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Make existing column NULLABLE
ALTER TABLE t1 MODIFY f2 INT, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Drop Stored Column
ALTER TABLE t1 DROP COLUMN f5, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Add base non-generated column as a last column in the compressed table
ALTER TABLE t1 ADD COLUMN f6 INT NOT NULL, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Add base non-generated column but not in the last position
ALTER TABLE t1 ADD COLUMN f7 INT NOT NULL after f3, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Force the table to rebuild
ALTER TABLE t1 FORCE, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Row format changes
ALTER TABLE t1 ROW_FORMAT=COMPRESSED, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Engine table
ALTER TABLE t1 ENGINE=INNODB, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
ALTER TABLE t1 FORCE, ALGORITHM=DEFAULT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
DROP TABLE t1;
affected rows: 0
CREATE TABLE t1(f1 INT PRIMARY KEY, f2 INT NOT NULL,
f3 INT AS (f2 * f2) VIRTUAL,
f4 INT NOT NULL UNIQUE,
f5 INT NOT NULL,
INDEX idx(f2))ENGINE=INNODB;
CREATE TABLE t2(f1 INT NOT NULL, f2 INT NOT NULL,
INDEX(f1),
FOREIGN KEY fidx(f1) REFERENCES t1(f1))ENGINE=INNODB;
INSERT INTO t1(f1, f2, f4, f5) VALUES(1, 2, 3, 4);
ALTER TABLE t1 ADD INDEX idx1(f4), page_compressed=1, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
ALTER TABLE t1 DROP INDEX idx, page_compression_level=5, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
ALTER TABLE t1 ADD UNIQUE INDEX u1(f2), ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
ALTER TABLE t1 DROP INDEX f4, page_compression_level=9, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
SET foreign_key_checks = 0;
affected rows: 0
ALTER TABLE t1 ADD FOREIGN KEY(f5) REFERENCES t2(f1), ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
DROP TABLE t2, t1;
affected rows: 0
CREATE TABLE t1(f1 INT NOT NULL,
f2 INT NOT NULL,
f3 INT AS (f2 * f2) VIRTUAL,
INDEX idx (f2))engine=innodb;
CREATE TABLE t2(f1 INT NOT NULL, f2 INT NOT NULL,
f3 VARCHAR(10),
INDEX(f1))ENGINE=INNODB;
INSERT INTO t1(f1, f2) VALUES(1, 1);
# Add column at the end of the table
ALTER TABLE t1 ADD COLUMN f4 char(100) default 'BIG WALL', ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Change virtual column expression
ALTER TABLE t1 CHANGE f3 f3 INT AS (f2 * f2) VIRTUAL, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Add virtual column
ALTER TABLE t1 ADD COLUMN f5 INT AS (f2) VIRTUAL, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Rename Column
ALTER TABLE t1 CHANGE f3 vcol INT AS (f2) VIRTUAL, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Rename table
ALTER TABLE t1 RENAME t3, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Drop Virtual Column
ALTER TABLE t3 DROP COLUMN vcol, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
# Column length varies
ALTER TABLE t2 CHANGE f3 f3 VARCHAR(20), ALGORITHM=COPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
SET foreign_key_checks = 0;
affected rows: 0
ALTER TABLE t3 ADD FOREIGN KEY fidx(f2) REFERENCES t2(f1), ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
SET foreign_key_checks = 1;
affected rows: 0
ALTER TABLE t3 DROP FOREIGN KEY fidx, ALGORITHM=COPY;
affected rows: 1
info: Records: 1  Duplicates: 0  Warnings: 0
DROP TABLE t3, t2;
affected rows: 0
#
# sql_mode:    alter_algorithm: INPLACE
#
CREATE TABLE t1(f1 INT NOT NULL,
f2 INT NOT NULL,
f3 INT NULL,
f4 INT as (f2) STORED,
f5 INT as (f3) STORED,
PRIMARY KEY(f1))ROW_FORMAT=COMPRESSED, ENGINE=INNODB;
INSERT INTO t1(f1, f2, f3) VALUES(1, 1, 1);
# All the following cases needs table rebuild
# Add and Drop primary key
ALTER TABLE t1 ADD COLUMN col1 INT NOT NULL,DROP PRIMARY KEY,ADD PRIMARY KEY(col1), ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Make existing column NULLABLE
ALTER TABLE t1 MODIFY f2 INT, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Drop Stored Column
ALTER TABLE t1 DROP COLUMN f5, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Add base non-generated column as a last column in the compressed table
ALTER TABLE t1 ADD COLUMN f6 INT NOT NULL, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Add base non-generated column but not in the last position
ALTER TABLE t1 ADD COLUMN f7 INT NOT NULL after f3, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Force the table to rebuild
ALTER TABLE t1 FORCE, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Row format changes
ALTER TABLE t1 ROW_FORMAT=COMPRESSED, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Engine table
ALTER TABLE t1 ENGINE=INNODB, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
ALTER TABLE t1 FORCE, ALGORITHM=DEFAULT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
DROP TABLE t1;
affected rows: 0
CREATE TABLE t1(f1 INT PRIMARY KEY, f2 INT NOT NULL,
f3 INT AS (f2 * f2) VIRTUAL,
f4 INT NOT NULL UNIQUE,
f5 INT NOT NULL,
INDEX idx(f2))ENGINE=INNODB;
CREATE TABLE t2(f1 INT NOT NULL, f2 INT NOT NULL,
INDEX(f1),
FOREIGN KEY fidx(f1) REFERENCES t1(f1))ENGINE=INNODB;
INSERT INTO t1(f1, f2, f4, f5) VALUES(1, 2, 3, 4);
ALTER TABLE t1 ADD INDEX idx1(f4), page_compressed=1, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
ALTER TABLE t1 DROP INDEX idx, page_compression_level=5, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
ALTER TABLE t1 ADD UNIQUE INDEX u1(f2), ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
ALTER TABLE t1 DROP INDEX f4, page_compression_level=9, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
SET foreign_key_checks = 0;
affected rows: 0
ALTER TABLE t1 ADD FOREIGN KEY(f5) REFERENCES t2(f1), ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
DROP TABLE t2, t1;
affected rows: 0
CREATE TABLE t1(f1 INT NOT NULL,
f2 INT NOT NULL,
f3 INT AS (f2 * f2) VIRTUAL,
INDEX idx (f2))engine=innodb;
CREATE TABLE t2(f1 INT NOT NULL, f2 INT NOT NULL,
f3 VARCHAR(10),
INDEX(f1))ENGINE=INNODB;
INSERT INTO t1(f1, f2) VALUES(1, 1);
# Add column at the end of the table
ALTER TABLE t1 ADD COLUMN f4 char(100) default 'BIG WALL', ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Change virtual column expression
ALTER TABLE t1 CHANGE f3 f3 INT AS (f2 * f2) VIRTUAL, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Add virtual column
ALTER TABLE t1 ADD COLUMN f5 INT AS (f2) VIRTUAL, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Rename Column
ALTER TABLE t1 CHANGE f3 vcol INT AS (f2) VIRTUAL, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Rename table
ALTER TABLE t1 RENAME t3, ALGORITHM=INPLACE;
affected rows: 0
# Drop Virtual Column
ALTER TABLE t3 DROP COLUMN vcol, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Column length varies
ALTER TABLE t2 CHANGE f3 f3 VARCHAR(20), ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
SET foreign_key_checks = 0;
affected rows: 0
ALTER TABLE t3 ADD FOREIGN KEY fidx(f2) REFERENCES t2(f1), ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
SET foreign_key_checks = 1;
affected rows: 0
ALTER TABLE t3 DROP FOREIGN KEY fidx, ALGORITHM=INPLACE;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
DROP TABLE t3, t2;
affected rows: 0
#
# sql_mode:    alter_algorithm: NOCOPY
#
CREATE TABLE t1(f1 INT NOT NULL,
f2 INT NOT NULL,
f3 INT NULL,
f4 INT as (f2) STORED,
f5 INT as (f3) STORED,
PRIMARY KEY(f1))ROW_FORMAT=COMPRESSED, ENGINE=INNODB;
INSERT INTO t1(f1, f2, f3) VALUES(1, 1, 1);
# All the following cases needs table rebuild
# Add and Drop primary key
ALTER TABLE t1 ADD COLUMN col1 INT NOT NULL,DROP PRIMARY KEY,ADD PRIMARY KEY(col1), ALGORITHM=NOCOPY;
Got one of the listed errors
# Make existing column NULLABLE
ALTER TABLE t1 MODIFY f2 INT, ALGORITHM=NOCOPY;
Got one of the listed errors
# Drop Stored Column
ALTER TABLE t1 DROP COLUMN f5, ALGORITHM=NOCOPY;
Got one of the listed errors
# Add base non-generated column as a last column in the compressed table
ALTER TABLE t1 ADD COLUMN f6 INT NOT NULL, ALGORITHM=NOCOPY;
Got one of the listed errors
# Add base non-generated column but not in the last position
ALTER TABLE t1 ADD COLUMN f7 INT NOT NULL after f3, ALGORITHM=NOCOPY;
Got one of the listed errors
# Force the table to rebuild
ALTER TABLE t1 FORCE, ALGORITHM=NOCOPY;
Got one of the listed errors
# Row format changes
ALTER TABLE t1 ROW_FORMAT=COMPRESSED, ALGORITHM=NOCOPY;
Got one of the listed errors
# Engine table
ALTER TABLE t1 ENGINE=INNODB, ALGORITHM=NOCOPY;
Got one of the listed errors
ALTER TABLE t1 FORCE, ALGORITHM=DEFAULT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
DROP TABLE t1;
affected rows: 0
CREATE TABLE t1(f1 INT PRIMARY KEY, f2 INT NOT NULL,
f3 INT AS (f2 * f2) VIRTUAL,
f4 INT NOT NULL UNIQUE,
f5 INT NOT NULL,
INDEX idx(f2))ENGINE=INNODB;
CREATE TABLE t2(f1 INT NOT NULL, f2 INT NOT NULL,
INDEX(f1),
FOREIGN KEY fidx(f1) REFERENCES t1(f1))ENGINE=INNODB;
INSERT INTO t1(f1, f2, f4, f5) VALUES(1, 2, 3, 4);
ALTER TABLE t1 ADD INDEX idx1(f4), page_compressed=1, ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
ALTER TABLE t1 DROP INDEX idx, page_compression_level=5, ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
ALTER TABLE t1 ADD UNIQUE INDEX u1(f2), ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
ALTER TABLE t1 DROP INDEX f4, page_compression_level=9, ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
SET foreign_key_checks = 0;
affected rows: 0
ALTER TABLE t1 ADD FOREIGN KEY(f5) REFERENCES t2(f1), ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
DROP TABLE t2, t1;
affected rows: 0
CREATE TABLE t1(f1 INT NOT NULL,
f2 INT NOT NULL,
f3 INT AS (f2 * f2) VIRTUAL,
INDEX idx (f2))engine=innodb;
CREATE TABLE t2(f1 INT NOT NULL, f2 INT NOT NULL,
f3 VARCHAR(10),
INDEX(f1))ENGINE=INNODB;
INSERT INTO t1(f1, f2) VALUES(1, 1);
# Add column at the end of the table
ALTER TABLE t1 ADD COLUMN f4 char(100) default 'BIG WALL', ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Change virtual column expression
ALTER TABLE t1 CHANGE f3 f3 INT AS (f2 * f2) VIRTUAL, ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Add virtual column
ALTER TABLE t1 ADD COLUMN f5 INT AS (f2) VIRTUAL, ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Rename Column
ALTER TABLE t1 CHANGE f3 vcol INT AS (f2) VIRTUAL, ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Rename table
ALTER TABLE t1 RENAME t3, ALGORITHM=NOCOPY;
affected rows: 0
# Drop Virtual Column
ALTER TABLE t3 DROP COLUMN vcol, ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Column length varies
ALTER TABLE t2 CHANGE f3 f3 VARCHAR(20), ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
SET foreign_key_checks = 0;
affected rows: 0
ALTER TABLE t3 ADD FOREIGN KEY fidx(f2) REFERENCES t2(f1), ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
SET foreign_key_checks = 1;
affected rows: 0
ALTER TABLE t3 DROP FOREIGN KEY fidx, ALGORITHM=NOCOPY;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
DROP TABLE t3, t2;
affected rows: 0
#
# sql_mode:    alter_algorithm: INSTANT
#
CREATE TABLE t1(f1 INT NOT NULL,
f2 INT NOT NULL,
f3 INT NULL,
f4 INT as (f2) STORED,
f5 INT as (f3) STORED,
PRIMARY KEY(f1))ROW_FORMAT=COMPRESSED, ENGINE=INNODB;
INSERT INTO t1(f1, f2, f3) VALUES(1, 1, 1);
# All the following cases needs table rebuild
# Add and Drop primary key
ALTER TABLE t1 ADD COLUMN col1 INT NOT NULL,DROP PRIMARY KEY,ADD PRIMARY KEY(col1), ALGORITHM=INSTANT;
Got one of the listed errors
# Make existing column NULLABLE
ALTER TABLE t1 MODIFY f2 INT, ALGORITHM=INSTANT;
Got one of the listed errors
# Drop Stored Column
ALTER TABLE t1 DROP COLUMN f5, ALGORITHM=INSTANT;
Got one of the listed errors
# Add base non-generated column as a last column in the compressed table
ALTER TABLE t1 ADD COLUMN f6 INT NOT NULL, ALGORITHM=INSTANT;
Got one of the listed errors
# Add base non-generated column but not in the last position
ALTER TABLE t1 ADD COLUMN f7 INT NOT NULL after f3, ALGORITHM=INSTANT;
Got one of the listed errors
# Force the table to rebuild
ALTER TABLE t1 FORCE, ALGORITHM=INSTANT;
Got one of the listed errors
# Row format changes
ALTER TABLE t1 ROW_FORMAT=COMPRESSED, ALGORITHM=INSTANT;
Got one of the listed errors
# Engine table
ALTER TABLE t1 ENGINE=INNODB, ALGORITHM=INSTANT;
Got one of the listed errors
ALTER TABLE t1 FORCE, ALGORITHM=DEFAULT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
DROP TABLE t1;
affected rows: 0
CREATE TABLE t1(f1 INT PRIMARY KEY, f2 INT NOT NULL,
f3 INT AS (f2 * f2) VIRTUAL,
f4 INT NOT NULL UNIQUE,
f5 INT NOT NULL,
INDEX idx(f2))ENGINE=INNODB;
CREATE TABLE t2(f1 INT NOT NULL, f2 INT NOT NULL,
INDEX(f1),
FOREIGN KEY fidx(f1) REFERENCES t1(f1))ENGINE=INNODB;
INSERT INTO t1(f1, f2, f4, f5) VALUES(1, 2, 3, 4);
ALTER TABLE t1 ADD INDEX idx1(f4), page_compressed=1, ALGORITHM=INSTANT;
ERROR 0A000: ALGORITHM=INSTANT is not supported. Reason: ADD INDEX. Try ALGORITHM=NOCOPY
ALTER TABLE t1 DROP INDEX idx, page_compression_level=5, ALGORITHM=INSTANT;
ERROR 0A000: ALGORITHM=INSTANT is not supported. Reason: DROP INDEX. Try ALGORITHM=NOCOPY
ALTER TABLE t1 ADD UNIQUE INDEX u1(f2), ALGORITHM=INSTANT;
ERROR 0A000: ALGORITHM=INSTANT is not supported. Reason: ADD INDEX. Try ALGORITHM=NOCOPY
ALTER TABLE t1 DROP INDEX f4, page_compression_level=9, ALGORITHM=INSTANT;
ERROR 0A000: ALGORITHM=INSTANT is not supported. Reason: DROP INDEX. Try ALGORITHM=NOCOPY
SET foreign_key_checks = 0;
affected rows: 0
ALTER TABLE t1 ADD FOREIGN KEY(f5) REFERENCES t2(f1), ALGORITHM=INSTANT;
ERROR 0A000: ALGORITHM=INSTANT is not supported. Reason: ADD INDEX. Try ALGORITHM=NOCOPY
DROP TABLE t2, t1;
affected rows: 0
CREATE TABLE t1(f1 INT NOT NULL,
f2 INT NOT NULL,
f3 INT AS (f2 * f2) VIRTUAL,
INDEX idx (f2))engine=innodb;
CREATE TABLE t2(f1 INT NOT NULL, f2 INT NOT NULL,
f3 VARCHAR(10),
INDEX(f1))ENGINE=INNODB;
INSERT INTO t1(f1, f2) VALUES(1, 1);
# Add column at the end of the table
ALTER TABLE t1 ADD COLUMN f4 char(100) default 'BIG WALL', ALGORITHM=INSTANT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Change virtual column expression
ALTER TABLE t1 CHANGE f3 f3 INT AS (f2 * f2) VIRTUAL, ALGORITHM=INSTANT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Add virtual column
ALTER TABLE t1 ADD COLUMN f5 INT AS (f2) VIRTUAL, ALGORITHM=INSTANT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Rename Column
ALTER TABLE t1 CHANGE f3 vcol INT AS (f2) VIRTUAL, ALGORITHM=INSTANT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Rename table
ALTER TABLE t1 RENAME t3, ALGORITHM=INSTANT;
affected rows: 0
# Drop Virtual Column
ALTER TABLE t3 DROP COLUMN vcol, ALGORITHM=INSTANT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
# Column length varies
ALTER TABLE t2 CHANGE f3 f3 VARCHAR(20), ALGORITHM=INSTANT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
SET foreign_key_checks = 0;
affected rows: 0
ALTER TABLE t3 ADD FOREIGN KEY fidx(f2) REFERENCES t2(f1), ALGORITHM=INSTANT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
SET foreign_key_checks = 1;
affected rows: 0
ALTER TABLE t3 DROP FOREIGN KEY fidx, ALGORITHM=INSTANT;
affected rows: 0
info: Records: 0  Duplicates: 0  Warnings: 0
DROP TABLE t3, t2;
affected rows: 0