[1.11.x] Fixed #27800 -- Fixed QuerySet.annotate(Length(...)).distinct() crash.

Backport of ac5f886c5610a6bca26dab10170b445d1e9df450 from master

1 files changed, 6 insertions, 1 deletions

diff --git a/tests/annotations/tests.py b/tests/annotations/tests.py
index b90286b9da..36e675402c 100644
--- a/tests/annotations/tests.py
+++ b/tests/annotations/tests.py
@@ -8,7 +8,7 @@ from django.db.models import (
     BooleanField, CharField, Count, DateTimeField, ExpressionWrapper, F, Func,
     IntegerField, NullBooleanField, Q, Sum, Value,
 )
-from django.db.models.functions import Lower
+from django.db.models.functions import Length, Lower
 from django.test import TestCase, skipUnlessDBFeature
 from django.utils import six
 
@@ -208,6 +208,11 @@ class NonAggregateAnnotationTestCase(TestCase):
         ).distinct('test_alias')
         self.assertEqual(len(people2), 1)
 
+        lengths = Employee.objects.annotate(
+            name_len=Length('first_name'),
+        ).distinct('name_len').values_list('name_len', flat=True)
+        self.assertSequenceEqual(lengths, [3, 7, 8])
+
     def test_filter_annotation(self):
         books = Book.objects.annotate(
             is_book=Value(1, output_field=IntegerField())