--source include/have_innodb.inc
--echo #
--echo #  MDEV-31086 MODIFY COLUMN can break FK constraints, and
--echo #        lead to unrestorable dumps
--echo #
CREATE TABLE t1(
  id SERIAL,
  msg VARCHAR(100) CHARACTER SET utf8mb3,
  KEY(msg))ENGINE=InnoDB;

--error ER_CANT_CREATE_TABLE
CREATE TABLE t2(
id SERIAL,
msg varchar(100) CHARACTER SET utf8mb4,
CONSTRAINT fk_t1 FOREIGN KEY (msg) REFERENCES t1 (msg))ENGINE=InnoDB;

CREATE TABLE t2(
id SERIAL,
msg varchar(100) CHARACTER SET utf8mb3,
msg_1 varchar(100) CHARACTER SET utf8mb3,
INDEX (msg_1),
INDEX (msg),
CONSTRAINT fk_t1 FOREIGN KEY (msg) REFERENCES t1 (msg)
ON DELETE CASCADE)ENGINE=InnoDB;

# Changing column used in FK constraint
SET FOREIGN_KEY_CHECKS=1;
--error ER_FK_COLUMN_CANNOT_CHANGE
ALTER TABLE t2 MODIFY COLUMN msg VARCHAR(200) character set utf8mb3, ALGORITHM=COPY;
--error ER_FK_COLUMN_CANNOT_CHANGE
ALTER TABLE t2 MODIFY COLUMN msg VARCHAR(200) character set utf8mb3, ALGORITHM=INPLACE;

SET FOREIGN_KEY_CHECKS=0;
--error ER_FK_COLUMN_CANNOT_CHANGE
ALTER TABLE t2 MODIFY COLUMN msg VARCHAR(200) character set utf8mb3, ALGORITHM=COPY;
--error ER_FK_COLUMN_CANNOT_CHANGE
ALTER TABLE t2 MODIFY COLUMN msg VARCHAR(400) character set utf8mb3, ALGORITHM=INPLACE;

# Changing column charset used in FK constraint
SET FOREIGN_KEY_CHECKS=1;
--error ER_FK_COLUMN_CANNOT_CHANGE
ALTER TABLE t2 MODIFY COLUMN msg VARCHAR(100) CHARACTER SET utf8mb4, ALGORITHM=COPY;

--error ER_ALTER_OPERATION_NOT_SUPPORTED_REASON
ALTER TABLE t2 MODIFY COLUMN msg VARCHAR(100) CHARACTER SET utf8mb4, ALGORITHM=INPLACE;

SET FOREIGN_KEY_CHECKS=0;
--error ER_FK_COLUMN_CANNOT_CHANGE
ALTER TABLE t2 MODIFY COLUMN msg VARCHAR(100) CHARACTER SET utf8mb4,ALGORITHM=COPY;

--error ER_ALTER_OPERATION_NOT_SUPPORTED_REASON
ALTER TABLE t2 MODIFY COLUMN msg VARCHAR(100) CHARACTER SET utf8mb4,ALGORITHM=INPLACE;

# Modify the column in the newly added foreign constraint
SET FOREIGN_KEY_CHECKS=1;
--error ER_CANT_CREATE_TABLE
ALTER TABLE t2 ADD CONSTRAINT FOREIGN KEY(msg_1) REFERENCES t1(msg),MODIFY COLUMN msg_1 VARCHAR(100) CHARACTER SET utf8mb4, ALGORITHM=COPY;

--error ER_ALTER_OPERATION_NOT_SUPPORTED_REASON
ALTER TABLE t2 ADD CONSTRAINT FOREIGN KEY(msg_1) REFERENCES t1(msg),MODIFY COLUMN msg_1 VARCHAR(100) CHARACTER SET utf8mb4, ALGORITHM=INPLACE;


SET FOREIGN_KEY_CHECKS=0;
--error ER_CANT_CREATE_TABLE
ALTER TABLE t2 ADD CONSTRAINT FOREIGN KEY(msg_1) REFERENCES t1(msg),MODIFY COLUMN msg_1 VARCHAR(100) CHARACTER SET utf8mb4, ALGORITHM=COPY;

--error ER_ALTER_OPERATION_NOT_SUPPORTED_REASON
ALTER TABLE t2 ADD CONSTRAINT FOREIGN KEY(msg_1) REFERENCES t1(msg),MODIFY COLUMN msg_1 VARCHAR(100) CHARACTER SET utf8mb4, ALGORITHM=INPLACE;

--error ER_FK_COLUMN_CANNOT_CHANGE
ALTER TABLE t2 ADD CONSTRAINT FOREIGN KEY(msg_1) REFERENCES t1(msg),MODIFY COLUMN msg_1 VARCHAR(200) CHARACTER SET utf8mb3, ALGORITHM=INPLACE;

# Change referenced table column
SET FOREIGN_KEY_CHECKS=1;
# Change referenced column length
--error ER_FK_COLUMN_CANNOT_CHANGE_CHILD
ALTER TABLE t1 MODIFY msg VARCHAR(200) CHARSET utf8mb3, ALGORITHM=COPY;
--error ER_FK_COLUMN_CANNOT_CHANGE_CHILD
ALTER TABLE t1 MODIFY msg VARCHAR(200) CHARSET utf8mb3, ALGORITHM=INPLACE;
# Change referenced column character set
--error ER_FK_COLUMN_CANNOT_CHANGE_CHILD
ALTER TABLE t1 MODIFY msg VARCHAR(200) CHARSET utf8mb4, ALGORITHM=COPY;
--error ER_ALTER_OPERATION_NOT_SUPPORTED_REASON
ALTER TABLE t1 MODIFY msg VARCHAR(200) CHARSET utf8mb4, ALGORITHM=INPLACE;

SET FOREIGN_KEY_CHECKS=0;
# Change referenced column length
--error ER_FK_COLUMN_CANNOT_CHANGE_CHILD
ALTER TABLE t1 MODIFY msg VARCHAR(200) CHARSET utf8mb3, ALGORITHM=COPY;
--error ER_FK_COLUMN_CANNOT_CHANGE_CHILD
ALTER TABLE t1 MODIFY msg VARCHAR(400) CHARSET utf8mb3, ALGORITHM=INPLACE;

# Change referenced column character set
--error ER_FK_COLUMN_CANNOT_CHANGE_CHILD
ALTER TABLE t1 MODIFY msg VARCHAR(200) CHARSET utf8mb4, ALGORITHM=COPY;
--error ER_ALTER_OPERATION_NOT_SUPPORTED_REASON
ALTER TABLE t1 MODIFY msg VARCHAR(200) CHARSET utf8mb4, ALGORITHM=INPLACE;

# Correct way to change character set in foreign key constraint
SET FOREIGN_KEY_CHECKS=0;
ALTER TABLE t2 DROP FOREIGN KEY fk_t1, MODIFY msg VARCHAR(200) CHARSET utf8mb4, ALGORITHM=COPY;
ALTER TABLE t1 MODIFY msg VARCHAR(200) CHARSET utf8mb4, ALGORITHM=COPY;
ALTER TABLE t2 ADD CONSTRAINT FOREIGN KEY (msg) REFERENCES t1(msg), aLGORITHM=INPLACE;
SET FOREIGN_KEY_CHECKS=1;

DROP TABLE t2, t1;

--echo #
--echo # MDEV-31869 Server aborts when table does drop column
--echo #
CREATE TABLE t (a VARCHAR(40), b INT, C INT) ENGINE=InnoDB;
ALTER TABLE t MODIFY a VARCHAR(50), DROP b;
DROP TABLE t;

--echo #
--echo #  MDEV-32060 Server aborts when table doesn't
--echo #		have referenced index
--echo #
SET SESSION FOREIGN_KEY_CHECKS = OFF;
CREATE TABLE t1 (a VARCHAR(16) KEY, FOREIGN KEY(a) REFERENCES t2(b)) ENGINE=InnoDB;
# Following SQL is allowed in 10.6
--error ER_CANT_CREATE_TABLE
CREATE TABLE t2 (b VARCHAR(8)) ENGINE=InnoDB;
SET SESSION FOREIGN_KEY_CHECKS = ON;
--error ER_NO_SUCH_TABLE
ALTER TABLE t2 MODIFY b VARCHAR(16), ADD KEY(b);
--error ER_BAD_TABLE_ERROR
DROP TABLE t2, t1;
--echo # End of 10.4 tests