fixed bug handling in views (BUG#5276)

mysql-test/r/view.result:
  bug handlimg from VIEWs
mysql-test/t/view.test:
  bug handlimg from VIEWs
sql/sql_base.cc:
  fixed bug handling in views

mysql-test/r/view.result

@@ -1246,3 +1246,10 @@ select * from v1;
 cast(1 as char(3))
 1
 drop view v1;
+create view v1 as select 'a',1;
+create view v2 as select * from v1 union all select * from v1;
+create view v3 as select * from v2 where 1 = (select `1` from v2);
+create view v4 as select * from v3;
+select * from v4;
+ERROR 21000: Subquery returns more than 1 row
+drop view v4, v3, v2, v1;

mysql-test/t/view.test

@@ -1196,3 +1196,14 @@ create view v1 as select cast(1 as char(3));
 show create view v1;
 select * from v1;
 drop view v1;
+
+#
+# bug handlimg from VIEWs
+#
+create view v1 as select 'a',1;
+create view v2 as select * from v1 union all select * from v1;
+create view v3 as select * from v2 where 1 = (select `1` from v2);
+create view v4 as select * from v3;
+-- error 1242
+select * from v4;
+drop view v4, v3, v2, v1;

sql/sql_base.cc

@@ -1761,9 +1761,9 @@ int open_and_lock_tables(THD *thd, TABLE_LIST *tables)
 {
   DBUG_ENTER("open_and_lock_tables");
   uint counter;
-  if (open_tables(thd, tables, &counter) || lock_tables(thd, tables, counter))
+  if (open_tables(thd, tables, &counter) || lock_tables(thd, tables, counter)
+      || mysql_handle_derived(thd->lex))
     DBUG_RETURN(thd->net.report_error ? -1 : 1); /* purecov: inspected */
-  DBUG_RETURN(mysql_handle_derived(thd->lex));
 }