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# # Bug#21704: Renaming column does not update FK definition. # # Test that it's not possible to rename columns participating in a # foreign key (either in the referencing or referenced table). CREATE TABLE t1 (a INT PRIMARY KEY, b INT) ROW_FORMAT=COMPACT ENGINE=INNODB; CREATE TABLE t2 (a INT PRIMARY KEY, b INT, CONSTRAINT fk1 FOREIGN KEY (a) REFERENCES t1(a)) ROW_FORMAT=COMPACT ENGINE=INNODB; CREATE TABLE t3 (a INT PRIMARY KEY, b INT, KEY(b), C INT, CONSTRAINT fk2 FOREIGN KEY (b) REFERENCES t3 (a)) ROW_FORMAT=COMPACT ENGINE=INNODB; INSERT INTO t1 VALUES (1,1),(2,2),(3,3); INSERT INTO t2 VALUES (1,1),(2,2),(3,3); INSERT INTO t3 VALUES (1,1,1),(2,2,2),(3,3,3); # Test renaming the column in the referenced table. ALTER TABLE t1 CHANGE a e INT; affected rows: 0 info: Records: 0 Duplicates: 0 Warnings: 0 # Ensure that online column rename works. ALTER TABLE t1 CHANGE b c INT; affected rows: 0 info: Records: 0 Duplicates: 0 Warnings: 0 # Test renaming the column in the referencing table ALTER TABLE t2 CHANGE a z INT; affected rows: 0 info: Records: 0 Duplicates: 0 Warnings: 0 # Ensure that online column rename works. ALTER TABLE t2 CHANGE b c INT; affected rows: 0 info: Records: 0 Duplicates: 0 Warnings: 0 # Test with self-referential constraints ALTER TABLE t3 CHANGE a f INT; affected rows: 0 info: Records: 0 Duplicates: 0 Warnings: 0 ALTER TABLE t3 CHANGE b g INT; affected rows: 0 info: Records: 0 Duplicates: 0 Warnings: 0 # Ensure that online column rename works. ALTER TABLE t3 CHANGE c d INT; affected rows: 0 info: Records: 0 Duplicates: 0 Warnings: 0 # Cleanup. SHOW CREATE TABLE t1; Table Create Table t1 CREATE TABLE `t1` ( `e` int(11) NOT NULL, `c` int(11) DEFAULT NULL, PRIMARY KEY (`e`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=COMPACT SHOW CREATE TABLE t2; Table Create Table t2 CREATE TABLE `t2` ( `z` int(11) NOT NULL, `c` int(11) DEFAULT NULL, PRIMARY KEY (`z`), CONSTRAINT `fk1` FOREIGN KEY (`z`) REFERENCES `t1` (`e`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=COMPACT SHOW CREATE TABLE t3; Table Create Table t3 CREATE TABLE `t3` ( `f` int(11) NOT NULL, `g` int(11) DEFAULT NULL, `d` int(11) DEFAULT NULL, PRIMARY KEY (`f`), KEY `b` (`g`), CONSTRAINT `fk2` FOREIGN KEY (`g`) REFERENCES `t3` (`f`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 ROW_FORMAT=COMPACT SELECT f.*, c.* FROM INFORMATION_SCHEMA.INNODB_SYS_FOREIGN_COLS c INNER JOIN INFORMATION_SCHEMA.INNODB_SYS_FOREIGN f ON c.ID=f.ID WHERE FOR_NAME LIKE 'test/t%'; ID FOR_NAME REF_NAME N_COLS TYPE ID FOR_COL_NAME REF_COL_NAME POS test/fk1 test/t2 test/t1 1 0 test/fk1 z e 0 test/fk2 test/t3 test/t3 1 0 test/fk2 g f 0 DROP TABLE t3; DROP TABLE t2; DROP TABLE t1;