Avoided creation of temporary set in Query.append_annotation_mask().

sir-sigurd · timgraham · commit 61410408133a · 2017-08-15T09:43:47.000-04:00
diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py
@@ -1784,7 +1784,7 @@ def set_annotation_mask(self, names):
 
     def append_annotation_mask(self, names):
         if self.annotation_select_mask is not None:
-            self.set_annotation_mask(set(names).union(self.annotation_select_mask))
+            self.set_annotation_mask(self.annotation_select_mask.union(names))
 
     def set_extra_mask(self, names):
         """
