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Refs #19102 -- Removed flaky test Ticket19102Tests.test_ticket_19102_distinct_on. 

The subquery pushdown only happens because another table is involved in
filter. It's not the distinct usage that causes the pushdown.

The distinct('description').order_by('pk') expression is not valid
because SELECT DISTINCT ON must match initial ORDER BY expressions
which is not the case here.
This commit is contained in:
Egidijus Macijauskas 2021-02-11 06:11:49 +01:00 committed by Mariusz Felisiak
parent f8f35e8c53
commit 4e8ecf0cb6
1 changed files with 0 additions and 14 deletions
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14
tests/delete_regress/tests.py
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@ -291,20 +291,6 @@ class Ticket19102Tests(TestCase):
self.assertFalse(Login.objects.filter(pk=self.l1.pk).exists()) self.assertFalse(Login.objects.filter(pk=self.l1.pk).exists())
self.assertTrue(Login.objects.filter(pk=self.l2.pk).exists()) self.assertTrue(Login.objects.filter(pk=self.l2.pk).exists())
@skipUnlessDBFeature("update_can_self_select")
@skipUnlessDBFeature('can_distinct_on_fields')
def test_ticket_19102_distinct_on(self):
# Both Login objs should have same description so that only the one
# having smaller PK will be deleted.
Login.objects.update(description='description')
with self.assertNumQueries(1):
Login.objects.distinct('description').order_by('pk').filter(
orgunit__name__isnull=False
).delete()
# Assumed that l1 which is created first has smaller PK.
self.assertFalse(Login.objects.filter(pk=self.l1.pk).exists())
self.assertTrue(Login.objects.filter(pk=self.l2.pk).exists())
@skipUnlessDBFeature("update_can_self_select") @skipUnlessDBFeature("update_can_self_select")
def test_ticket_19102_select_related(self): def test_ticket_19102_select_related(self):
with self.assertNumQueries(1): with self.assertNumQueries(1):