1 files changed, 76 insertions, 0 deletions
diff --git a/mysql-test/suite/innodb/t/innodb_bug21704.test b/mysql-test/suite/innodb/t/innodb_bug21704.test
new file mode 100644
index 00000000..82e7c81d
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+++ b/mysql-test/suite/innodb/t/innodb_bug21704.test
@@ -0,0 +1,76 @@
+-- source include/have_innodb.inc
+
+--echo #
+--echo # Bug#21704: Renaming column does not update FK definition.
+--echo #
+
+--echo
+--echo # Test that it's not possible to rename columns participating in a
+--echo # foreign key (either in the referencing or referenced table).
+--echo
+
+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);
+
+--echo
+--echo # Test renaming the column in the referenced table.
+--echo
+
+--enable_info
+ALTER TABLE t1 CHANGE a e INT;
+
+--echo # Ensure that online column rename works.
+
+ALTER TABLE t1 CHANGE b c INT;
+
+--echo
+--echo # Test renaming the column in the referencing table
+--echo
+
+ALTER TABLE t2 CHANGE a z INT;
+
+--echo # Ensure that online column rename works.
+
+ALTER TABLE t2 CHANGE b c INT;
+
+--echo
+--echo # Test with self-referential constraints
+--echo
+
+ALTER TABLE t3 CHANGE a f INT;
+
+ALTER TABLE t3 CHANGE b g INT;
+
+--echo # Ensure that online column rename works.
+
+ALTER TABLE t3 CHANGE c d INT;
+
+--echo
+--echo # Cleanup.
+--echo
+
+--disable_info
+SHOW CREATE TABLE t1;
+SHOW CREATE TABLE t2;
+SHOW CREATE TABLE t3;
+
+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%';
+
+DROP TABLE t3;
+DROP TABLE t2;
+DROP TABLE t1;