If an SQL query doesn't specify any ordering, avoid the implicit sort

that happens with MySQL when a "GROUP BY" clause is included. This is a
backend-specific operation, so any other databases requiring similar
encouragement can have a function added to their own backend code.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@9637 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 8 insertions, 0 deletions

diff --git a/django/db/backends/__init__.py b/django/db/backends/__init__.py
index 353eb39488..736667d2ff 100644
--- a/django/db/backends/__init__.py
+++ b/django/db/backends/__init__.py
@@ -143,6 +143,14 @@ class BaseDatabaseOperations(object):
         """
         return '%s'
 
+    def force_no_ordering(self):
+        """
+        Returns a list used in the "ORDER BY" clause to force no ordering at
+        all. Returning an empty list means that nothing will be included in the
+        ordering.
+        """
+        return []
+
     def fulltext_search_sql(self, field_name):
         """
         Returns the SQL WHERE clause to use in order to perform a full-text