--source include/have_innodb.inc
--echo #
--echo #  MDEV-22230 : Unexpected ER_ERROR_ON_RENAME upon DROP
--echo #	non-existing FOREIGN KEY
--echo #
CREATE TABLE t1 (a INT) ENGINE=InnoDB;
--error ER_CANT_DROP_FIELD_OR_KEY
ALTER TABLE t1 DROP FOREIGN KEY x, ALGORITHM=COPY;
--error ER_CANT_DROP_FIELD_OR_KEY
ALTER TABLE t1 DROP FOREIGN KEY x, ALGORITHM=INPLACE;
# Cleanup
DROP TABLE t1;

CREATE TABLE t1 (a INT, KEY(a)) ENGINE=InnoDB;
CREATE TABLE t2 (a INT, FOREIGN KEY fk_id (a) REFERENCES t1(a))ENGINE=InnoDB;
CREATE TABLE t3 (a INT, FOREIGN KEY fk_1 (a) REFERENCES t1(a))ENGINE=InnoDB;
ALTER TABLE t3 DROP FOREIGN KEY IF EXISTS fk_id;
DROP TABLE t3, t2;
ALTER TABLE t1 MODIFY COLUMN a VARCHAR(2), DROP FOREIGN KEY IF EXISTS x;
DROP TABLE t1;

CREATE DATABASE best;
CREATE TABLE best.t1(f1 INT, KEY(f1))ENGINE=InnoDB;
CREATE TABLE best.t2(f1 INT, FOREIGN KEY foo(f1) REFERENCES t1(f1))ENGINE=InnoDB;

CREATE TABLE t1(f1 INT, KEY(f1))ENGINE=InnoDB;
CREATE TABLE t2(f1 INT, FOREIGN KEY foo(f1) REFERENCES t1(f1))ENGINE=InnoDB;
ALTER TABLE t2 DROP FOREIGN KEY foo;
--error ER_CANT_DROP_FIELD_OR_KEY
ALTER TABLE t2 DROP FOREIGN KEY foo;
ALTER TABLE t2 DROP FOREIGN KEY IF EXISTS foo;
SHOW CREATE TABLE best.t2;
SELECT * FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN;
DROP TABLE best.t2, best.t1, t2, t1;
DROP DATABASE best;