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#
# Bug#15863023 SUPPORT IN-PLACE EXTENSION OF VARCHAR COLUMN
#
CREATE TABLE t1 (pk VARCHAR(2) PRIMARY KEY) ENGINE=InnoDB;
CREATE TABLE t2 (fk VARCHAR(2), FOREIGN KEY (fk) REFERENCES t1 (pk))
ENGINE=InnoDB;
INSERT INTO t1 VALUES ('aa'), ('bb');
INSERT INTO t2 VALUES ('aa'), ('bb');
ALTER TABLE t1 ALGORITHM=INPLACE, CHANGE COLUMN pk pk VARCHAR(5);
INSERT INTO t1 VALUES ('co');
INSERT INTO t2 VALUES ('co');
INSERT IGNORE INTO t2 VALUES ('code');
Warnings:
Warning 1265 Data truncated for column 'fk' at row 1
ALTER TABLE t2 ALGORITHM=INPLACE, CHANGE COLUMN fk fk VARCHAR(7);
INSERT INTO t2 VALUES ('code');
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `t1` (`pk`))
INSERT INTO t2 VALUES ('coastal');
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `t1` (`pk`))
INSERT INTO t2 VALUES ('coast');
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `t1` (`pk`))
INSERT INTO t1 VALUES ('coast');
INSERT INTO t2 VALUES ('coastal');
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`fk`) REFERENCES `t1` (`pk`))
INSERT INTO t2 VALUES ('coast');
DROP TABLE t2, t1;
CREATE TABLE t1 (pk VARCHAR(2) PRIMARY KEY) ENGINE=InnoDB;
CREATE TABLE t2 (fk VARCHAR(2),
CONSTRAINT fk FOREIGN KEY (fk) REFERENCES t1 (pk))
ENGINE=InnoDB;
INSERT INTO t1 VALUES ('aa'), ('bb');
INSERT INTO t2 VALUES ('aa'), ('bb');
ALTER TABLE t2 ALGORITHM=INPLACE, CHANGE COLUMN fk fk VARCHAR(6);
ALTER TABLE t2 ALGORITHM=INPLACE, CHANGE COLUMN fk fk VARCHAR(255);
# We cannot shrink the size or cross the 256-byte boundary.
ALTER TABLE t2 ALGORITHM=INPLACE, CHANGE COLUMN fk fk VARCHAR(6);
ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Cannot change column type INPLACE. Try ALGORITHM=COPY.
ALTER TABLE t2 ALGORITHM=INPLACE, CHANGE COLUMN fk fk VARCHAR(256);
ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Cannot change column type INPLACE. Try ALGORITHM=COPY.
# ALGORITHM=COPY has more limitations with FOREIGN KEY.
ALTER TABLE t2 CHANGE COLUMN fk fk VARCHAR(256);
ERROR HY000: Cannot change column 'fk': used in a foreign key constraint 'fk'
ALTER TABLE t2 ALGORITHM=INPLACE, DROP FOREIGN KEY fk;
ALTER TABLE t2 CHANGE COLUMN fk fk VARCHAR(256);
ALTER TABLE t2 ALGORITHM=INPLACE, CHANGE COLUMN fk fk VARCHAR(300);
SET sql_mode = 'NO_ENGINE_SUBSTITUTION';
Warnings:
Warning 3090 Changing sql mode 'NO_AUTO_CREATE_USER' is deprecated. It will be removed in a future release.
ALTER TABLE t2 ALGORITHM=INPLACE, CHANGE COLUMN fk fk VARCHAR(99999);
ERROR 42000: BLOB/TEXT column 'fk' used in key specification without a key length
ALTER TABLE t2 ALGORITHM=INPLACE, DROP INDEX fk;
# Type change from VARCHAR to BLOB is not supported.
ALTER TABLE t2 ALGORITHM=INPLACE, CHANGE COLUMN fk fk VARCHAR(99999);
ERROR 0A000: ALGORITHM=INPLACE is not supported. Reason: Cannot change column type INPLACE. Try ALGORITHM=COPY.
DROP TABLE t2, t1;
SET sql_mode = default;