fixed problem in view over view setup (BUG#7433)

mysql-test/r/view.result:
  view over other view setup
mysql-test/t/view.test:
  view over other view setup
sql/table.cc:
  before using ancestor, check that it exists

1 files changed, 1 insertions, 1 deletions

diff --git a/sql/table.cc b/sql/table.cc
index a67563ff34f..3e1fc22e0f0 100644
--- a/sql/table.cc
+++ b/sql/table.cc
@@ -1613,7 +1613,7 @@ void st_table_list::set_ancestor()
     tbl->table->grant= grant;
   }
   /* if view contain only one table, substitute TABLE of it */
-  if (!ancestor->next_local)
+  if (ancestor && !ancestor->next_local)
   {
     table= ancestor->table;
     schema_table= ancestor->schema_table;