1 files changed, 20 insertions, 0 deletions
diff --git a/mysql-test/t/key.test b/mysql-test/t/key.test
index 6fc975a1cb3..1996c793880 100644
--- a/mysql-test/t/key.test
+++ b/mysql-test/t/key.test
@@ -168,3 +168,23 @@ drop table t1;
 create table t1 (a int not null unique, b int unique, c int, d int not null primary key, key(c), e int not null unique);
 show keys from t1;
 drop table t1;
+
+#
+# Problem with UNIQUE() with NULL parts and auto increment
+#
+
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (c CHAR(10) NOT NULL,i INT NOT NULL AUTO_INCREMENT,
+UNIQUE (c,i));
+INSERT INTO t1 (c) VALUES (NULL),(NULL);
+SELECT * FROM t1;
+INSERT INTO t1 (c) VALUES ('a'),('a');
+SELECT * FROM t1;
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (c CHAR(10) NULL, i INT NOT NULL AUTO_INCREMENT,
+UNIQUE (c,i));
+INSERT INTO t1 (c) VALUES (NULL),(NULL);
+SELECT * FROM t1;
+INSERT INTO t1 (c) VALUES ('a'),('a');
+SELECT * FROM t1;
+drop table t1;