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[1.5.x] Fixed #20091 -- Oracle null promotion for empty strings

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Backpatch of e17fa9e877
This commit is contained in:
Anssi Kääriäinen
2013-03-24 22:59:44 +02:00
parent 5e2bb1223c
commit 207117ae73
2 changed files with 16 additions and 2 deletions
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9
tests/regressiontests/queries/tests.py
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@@ -1533,7 +1533,6 @@ class Queries6Tests(TestCase):
# Nested queries are possible (although should be used with care, since
# they have performance problems on backends like MySQL.
self.assertQuerysetEqual(
Annotation.objects.filter(notes__in=Note.objects.filter(note="n1")),
['<Annotation: a1>']
@@ -2142,3 +2141,11 @@ class NullJoinPromotionOrTest(TestCase):
# so we can use INNER JOIN for it. However, we can NOT use INNER JOIN
# for the b->c join, as a->b is nullable.
self.assertEqual(str(qset.query).count('INNER JOIN'), 1)
class EmptyStringPromotionTests(TestCase):
def test_empty_string_promotion(self):
qs = RelatedObject.objects.filter(single__name='')
if connection.features.interprets_empty_strings_as_nulls:
self.assertIn('LEFT OUTER JOIN', str(qs.query))
else:
self.assertNotIn('LEFT OUTER JOIN', str(qs.query))