Fixed #27800 -- Fixed QuerySet.annotate(Length(...)).distinct() crash.

1 files changed, 6 insertions, 1 deletions

diff --git a/tests/annotations/tests.py b/tests/annotations/tests.py
index 65886b2063..b149ddf46c 100644
--- a/tests/annotations/tests.py
+++ b/tests/annotations/tests.py
@@ -6,7 +6,7 @@ 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 .models import (
@@ -205,6 +205,11 @@ 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())