[1.11.x] Fixed #28848 -- Fixed SQLite/MySQL crash when ordering by a filtered subquery that uses nulls_first/nulls_last.

Backport of 616f468760e4984915bb2ccca6b9eb3d80ddadb0 from master

1 files changed, 22 insertions, 1 deletions

diff --git a/tests/ordering/tests.py b/tests/ordering/tests.py
index 62ce558a93..d93c511e61 100644
--- a/tests/ordering/tests.py
+++ b/tests/ordering/tests.py
@@ -3,7 +3,7 @@ from __future__ import unicode_literals
 from datetime import datetime
 from operator import attrgetter
 
-from django.db.models import F
+from django.db.models import DateTimeField, F, Max, OuterRef, Subquery
 from django.db.models.functions import Upper
 from django.test import TestCase
 
@@ -140,6 +140,27 @@ class OrderingTests(TestCase):
             [self.a1, self.a2, self.a4, self.a3],
         )
 
+    def test_orders_nulls_first_on_filtered_subquery(self):
+        Article.objects.filter(headline='Article 1').update(author=self.author_1)
+        Article.objects.filter(headline='Article 2').update(author=self.author_1)
+        Article.objects.filter(headline='Article 4').update(author=self.author_2)
+        Author.objects.filter(name__isnull=True).delete()
+        author_3 = Author.objects.create(name='Name 3')
+        article_subquery = Article.objects.filter(
+            author=OuterRef('pk'),
+            headline__icontains='Article',
+        ).order_by().values('author').annotate(
+            last_date=Max('pub_date'),
+        ).values('last_date')
+        self.assertQuerysetEqualReversible(
+            Author.objects.annotate(
+                last_date=Subquery(article_subquery, output_field=DateTimeField())
+            ).order_by(
+                F('last_date').asc(nulls_first=True)
+            ).distinct(),
+            [author_3, self.author_1, self.author_2],
+        )
+
     def test_stop_slicing(self):
         """
         Use the 'stop' part of slicing notation to limit the results.