current/SOURCES/mariadb-5.5-no-MDL-locks-for-aliases.patch

=== 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);
 }
 

1	=== modified file 'a/sql/sql_parse.cc'
2	--- a/sql/sql_parse.cc 2012-05-28 05:44:43 +0000
3	+++ b/sql/sql_parse.cc 2012-12-05 13:24:45 +0000
4	@@ -6000,8 +6000,13 @@
5	ptr->next_name_resolution_table= NULL;
6	/* Link table in global list (all used tables) */
7	lex->add_to_query_tables(ptr);
8	- ptr->mdl_request.init(MDL_key::TABLE, ptr->db, ptr->table_name, mdl_type,
9	- MDL_TRANSACTION);
10	+
11	+ // Pure table aliases do not need to be locked:
12	+ if (!test(table_options & TL_OPTION_ALIAS))
13	+ {
14	+ ptr->mdl_request.init(MDL_key::TABLE, ptr->db, ptr->table_name, mdl_type,
15	+ MDL_TRANSACTION);
16	+ }
17	DBUG_RETURN(ptr);
18	}
19
20