Manual merge from mysql-trunk-merge.

1 files changed, 54 insertions, 0 deletions

diff --git a/mysql-test/t/join.test b/mysql-test/t/join.test
index 1cd05c8cb65..dbf36dedec8 100644
--- a/mysql-test/t/join.test
+++ b/mysql-test/t/join.test
@@ -730,6 +730,60 @@ SELECT * FROM t1 JOIN t2 ON a=c ORDER BY a;
 
 DROP TABLE IF EXISTS t1,t2;
 
+
+--echo #
+--echo # Bug #42116: Mysql crash on specific query
+--echo #
+CREATE TABLE t1 (a INT);
+CREATE TABLE t2 (a INT);
+CREATE TABLE t3 (a INT, INDEX (a));
+CREATE TABLE t4 (a INT);
+CREATE TABLE t5 (a INT);
+CREATE TABLE t6 (a INT);
+
+INSERT INTO t1 VALUES (1), (1), (1);
+
+INSERT INTO t2 VALUES
+(2), (2), (2), (2), (2), (2), (2), (2), (2), (2);
+
+INSERT INTO t3 VALUES
+(3), (3), (3), (3), (3), (3), (3), (3), (3), (3);
+
+EXPLAIN
+SELECT * 
+FROM 
+  t1 JOIN t2 ON t1.a = t2.a 
+  LEFT JOIN 
+  (
+   (
+    t3 LEFT JOIN t4 ON t3.a = t4.a
+   ) 
+   LEFT JOIN 
+   (
+     t5 LEFT JOIN t6 ON t5.a = t6.a
+   ) 
+   ON t4.a = t5.a
+  ) 
+  ON t1.a = t3.a;
+
+SELECT * 
+FROM 
+  t1 JOIN t2 ON t1.a = t2.a 
+  LEFT JOIN 
+  (
+   (
+    t3 LEFT JOIN t4 ON t3.a = t4.a
+   ) 
+   LEFT JOIN 
+   (
+     t5 LEFT JOIN t6 ON t5.a = t6.a
+   ) 
+   ON t4.a = t5.a
+  ) 
+  ON t1.a = t3.a;
+
+DROP TABLE t1,t2,t3,t4,t5,t6;
+
 --echo End of 5.0 tests.