Add test for Bug# 21409, the actual bug was fixed in r1334.

mysql-test/innodb.result

@@ -3223,3 +3223,36 @@ c25 CHAR(255), c26 CHAR(255), c27 CHAR(255), c28 CHAR(255),
 c29 CHAR(255), c30 CHAR(255), c31 CHAR(255), c32 CHAR(255)
 ) ENGINE = InnoDB;
 ERROR 42000: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. You have to change some columns to TEXT or BLOBs
+SET TX_ISOLATION='read-committed';
+SET AUTOCOMMIT=0;
+DROP TABLE IF EXISTS t1, t2;
+Warnings:
+Note	1051	Unknown table 't1'
+Note	1051	Unknown table 't2'
+CREATE TABLE t1 ( a int ) ENGINE=InnoDB;
+CREATE TABLE t2 LIKE t1;
+SELECT * FROM t2;
+a
+SET TX_ISOLATION='read-committed';
+SET AUTOCOMMIT=0;
+INSERT INTO t1 VALUES (1);
+COMMIT;
+SELECT * FROM t1 WHERE a=1;
+a
+1
+SET TX_ISOLATION='read-committed';
+SET AUTOCOMMIT=0;
+SELECT * FROM t2;
+a
+SET TX_ISOLATION='read-committed';
+SET AUTOCOMMIT=0;
+INSERT INTO t1 VALUES (2);
+COMMIT;
+SELECT * FROM t1 WHERE a=2;
+a
+2
+SELECT * FROM t1 WHERE a=2;
+a
+2
+DROP TABLE t1;
+DROP TABLE t2;

mysql-test/innodb.test

@@ -2367,6 +2367,48 @@ CREATE TABLE t1 (
 	c29 CHAR(255), c30 CHAR(255), c31 CHAR(255), c32 CHAR(255)
 	) ENGINE = InnoDB;
 
+# 
+# Bug #21409 Incorrect result returned when in READ-COMMITTED with
+# query_cache ON
+#
+CONNECT (c1,localhost,root,,);
+CONNECT (c2,localhost,root,,);
+CONNECTION c1;
+SET TX_ISOLATION='read-committed';
+SET AUTOCOMMIT=0;
+DROP TABLE IF EXISTS t1, t2;
+CREATE TABLE t1 ( a int ) ENGINE=InnoDB;
+CREATE TABLE t2 LIKE t1;
+SELECT * FROM t2;
+CONNECTION c2;
+SET TX_ISOLATION='read-committed';
+SET AUTOCOMMIT=0;
+INSERT INTO t1 VALUES (1);
+COMMIT;
+CONNECTION c1;
+SELECT * FROM t1 WHERE a=1;
+DISCONNECT c1;
+DISCONNECT c2;
+CONNECT (c1,localhost,root,,);
+CONNECT (c2,localhost,root,,);
+CONNECTION c1;
+SET TX_ISOLATION='read-committed';
+SET AUTOCOMMIT=0;
+SELECT * FROM t2;
+CONNECTION c2;
+SET TX_ISOLATION='read-committed';
+SET AUTOCOMMIT=0;
+INSERT INTO t1 VALUES (2);
+COMMIT;
+CONNECTION c1;
+# The result set below should be the same for both selects
+SELECT * FROM t1 WHERE a=2;
+SELECT * FROM t1 WHERE a=2;
+DROP TABLE t1;
+DROP TABLE t2;
+DISCONNECT c1;
+DISCONNECT c2;
+
 #######################################################################
 #                                                                     #
 # Please, DO NOT TOUCH this file as well as the innodb.result file.   #