Fixed bug #28561: assertion abort for update on multi-table view with

CHECK OPTION and a subquery in WHERE condition.
The abort was triggered by setting the value of join->tables for
subqueries in the function JOIN::cleanup. This function was called
after an invocation of the JOIN::join_free method for subqueries
used in WHERE condition.

mysql-test/r/view.result

@@ -3367,4 +3367,14 @@ SHOW CREATE VIEW v1;
 View	Create View
 v1	CREATE ALGORITHM=UNDEFINED DEFINER=`root`@`localhost` SQL SECURITY DEFINER VIEW `v1` AS select cast(1.23456789 as decimal(8,0)) AS `col`
 DROP VIEW v1;
+CREATE TABLE t1 (id int);
+CREATE TABLE t2 (id int, c int DEFAULT 0);
+INSERT INTO t1 (id) VALUES (1);
+INSERT INTO t2 (id) VALUES (1);
+CREATE VIEW v1 AS 
+SELECT t2.c FROM t1, t2 
+WHERE t1.id=t2.id AND 1 IN (SELECT id FROM t1) WITH CHECK OPTION;
+UPDATE v1 SET c=1;
+DROP VIEW v1;
+DROP TABLE t1,t2;
 End of 5.0 tests.

mysql-test/t/view.test

@@ -3233,4 +3233,23 @@ CREATE VIEW v1 AS SELECT CAST(1.23456789 AS DECIMAL(8,0)) AS col;
 SHOW CREATE VIEW v1;
 DROP VIEW v1;
 
+#
+# Bug #28561: update on multi-table view with CHECK OPTION and
+#             a subquery in WHERE condition
+#
+
+CREATE TABLE t1 (id int);
+CREATE TABLE t2 (id int, c int DEFAULT 0);
+INSERT INTO t1 (id) VALUES (1);
+INSERT INTO t2 (id) VALUES (1);
+
+CREATE VIEW v1 AS 
+  SELECT t2.c FROM t1, t2 
+    WHERE t1.id=t2.id AND 1 IN (SELECT id FROM t1) WITH CHECK OPTION;
+
+UPDATE v1 SET c=1;
+
+DROP VIEW v1;
+DROP TABLE t1,t2;
+
 --echo End of 5.0 tests.

sql/sql_select.cc

@@ -6375,7 +6375,6 @@ void JOIN::cleanup(bool full)
       for (tab= join_tab, end= tab+tables; tab != end; tab++)
 	tab->cleanup();
       table= 0;
-      tables= 0;
     }
     else
     {