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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).
+
+DROP TABLE IF EXISTS t1;
+DROP TABLE IF EXISTS t2;
+DROP TABLE IF EXISTS t3;
+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 c INT;
+ERROR HY000: Error on rename of '#sql-temporary' to './test/t1' (errno: 150)
+# 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 c INT;
+ERROR HY000: Error on rename of '#sql-temporary' to './test/t2' (errno: 150)
+# 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 d INT;
+ERROR HY000: Error on rename of '#sql-temporary' to './test/t3' (errno: 150)
+ALTER TABLE t3 CHANGE b d INT;
+ERROR HY000: Error on rename of '#sql-temporary' to './test/t3' (errno: 150)
+# Ensure that online column rename works.
+ALTER TABLE t3 CHANGE c d INT;
+affected rows: 0
+info: Records: 0  Duplicates: 0  Warnings: 0
+
+# Cleanup.
+
+DROP TABLE t3;
+DROP TABLE t2;
+DROP TABLE t1;