[1.7.x] Skipped a broken geoapp test on Oracle; refs #23504.

Backport of 729cd6a11a from master

django/contrib/gis/tests/geoapp/tests.py

@@ -773,7 +773,11 @@ class GeoQuerySetTest(TestCase):
                         self.assertAlmostEqual(c1[0] + xfac, c2[0], 5)
                         self.assertAlmostEqual(c1[1] + yfac, c2[1], 5)
 
+    # TODO: Oracle can be made to pass if
+    # union1 = union2 = fromstr('POINT (-97.5211570000000023 34.4646419999999978)')
+    # but this seems unexpected and should be investigated to determine the cause.
     @no_mysql
+    @no_oracle
     def test_unionagg(self):
         "Testing the `unionagg` (aggregate union) GeoQuerySet method."
         tx = Country.objects.get(name='Texas').mpoly