1 files changed, 45 insertions, 0 deletions
diff --git a/mysql-test/t/subselect_cache.test b/mysql-test/t/subselect_cache.test
index 9045c7f0e14..e8dd256b20b 100644
--- a/mysql-test/t/subselect_cache.test
+++ b/mysql-test/t/subselect_cache.test
@@ -1566,3 +1566,48 @@ FROM t2 ) AND table1 .`col_varchar_key` OR table1 .`pk` ;
 
 drop table t1,t2;
 set @@optimizer_switch= default;
+
+#
+--echo # LP BUG#615378 (incorrect NULL result returning in Item_cache)
+#
+# if bug present here will be valgrind warnings (due to attempt to process
+# uninialized decimal value) but the result will be correct (due to 
+# Item::null_value) 
+
+CREATE TABLE `t1` (
+  `pk` int(11) NOT NULL AUTO_INCREMENT,
+  `col_varchar_key` varchar(1) DEFAULT NULL,
+  PRIMARY KEY (`pk`),
+  KEY `col_varchar_key` (`col_varchar_key`)
+) DEFAULT CHARSET=latin1;
+INSERT INTO `t1` VALUES (10,'v');
+INSERT INTO `t1` VALUES (11,'r');
+CREATE TABLE `t2` (
+  `pk` int(11) NOT NULL AUTO_INCREMENT,
+  `col_varchar_key` varchar(1) DEFAULT NULL,
+  PRIMARY KEY (`pk`),
+  KEY `col_varchar_key` (`col_varchar_key`)
+) DEFAULT CHARSET=latin1;
+INSERT INTO `t2` VALUES (1,'r');
+INSERT INTO `t2` VALUES (2,'c');
+CREATE TABLE `t3` (
+  `pk` int(11) NOT NULL AUTO_INCREMENT,
+  `col_varchar_key` varchar(1) DEFAULT NULL,
+  PRIMARY KEY (`pk`),
+  KEY `col_varchar_key` (`col_varchar_key`)
+) DEFAULT CHARSET=latin1;
+INSERT INTO `t3` VALUES (1,'w');
+
+SELECT  SUM( DISTINCT table2 . `pk` ) AS field2 ,
+(SELECT SUM( SUBQUERY1_t2 . `pk` ) AS SUBQUERY1_field1
+ FROM t2 AS SUBQUERY1_t2 STRAIGHT_JOIN
+      t3 AS SUBQUERY1_t3 ON (SUBQUERY1_t3 . `pk` = SUBQUERY1_t2 . `pk` )
+ WHERE  table1 . `col_varchar_key` ) AS field3  
+FROM ( t1 AS table1 LEFT JOIN
+       ( t2 AS table2 STRAIGHT_JOIN
+         t3 AS table3 ON (table3 . `pk` = table2 . `pk` ) )
+       ON (table3 . `col_varchar_key` = table1 . `col_varchar_key` ) )
+WHERE ( table1 . `pk` < 5 ) OR ( table1 . `col_varchar_key` IS NOT NULL)
+GROUP BY field3
+HAVING (field3 <= 'h' AND field2 != 4) ;
+drop tables t1, t2, t3;