=== modified file 'a/sql/sql_parse.cc'
--- a/sql/sql_parse.cc	2012-05-28 05:44:43 +0000
+++ b/sql/sql_parse.cc	2012-12-05 13:24:45 +0000
@@ -6000,8 +6000,13 @@
   ptr->next_name_resolution_table= NULL;
   /* Link table in global list (all used tables) */
   lex->add_to_query_tables(ptr);
-  ptr->mdl_request.init(MDL_key::TABLE, ptr->db, ptr->table_name, mdl_type,
-                        MDL_TRANSACTION);
+
+  // Pure table aliases do not need to be locked:
+  if (!test(table_options & TL_OPTION_ALIAS))
+  {
+    ptr->mdl_request.init(MDL_key::TABLE, ptr->db, ptr->table_name, mdl_type,
+                          MDL_TRANSACTION);
+  }
   DBUG_RETURN(ptr);
 }