Ticket #17276: 17276_tests.diff

tests/regressiontests/queries/tests.py

@@ -1877 +1877 @@
             DumbCategory.objects.create()
         except TypeError:
             self.fail("Creation of an instance of a model with only the PK field shouldn't error out after bulk insert refactoring (#17056)")
+
+
+class M2MAntiJoinTest(TestCase):
+    def test_join_removal(self):
+        sql = str(Annotation.objects.filter(notes__isnull=True).query)
+        self.assertEqual(sql.count(' LEFT '), 1)