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-rw-r--r--tests/annotations/tests.py15
1 files changed, 14 insertions, 1 deletions
diff --git a/tests/annotations/tests.py b/tests/annotations/tests.py
index d57f9ed0d7..28627e84ae 100644
--- a/tests/annotations/tests.py
+++ b/tests/annotations/tests.py
@@ -6,7 +6,7 @@ from decimal import Decimal
from django.core.exceptions import FieldDoesNotExist, FieldError
from django.db.models import (
BooleanField, CharField, Count, DateTimeField, ExpressionWrapper, F, Func,
- IntegerField, Sum, Value,
+ IntegerField, Q, Sum, Value,
)
from django.db.models.functions import Lower
from django.test import TestCase, skipUnlessDBFeature
@@ -148,6 +148,19 @@ class NonAggregateAnnotationTestCase(TestCase):
combined = int(test.pages + test.rating)
self.assertEqual(b.combined, combined)
+ def test_empty_expression_annotation(self):
+ books = Book.objects.annotate(
+ selected=ExpressionWrapper(Q(pk__in=[]), output_field=BooleanField())
+ )
+ self.assertEqual(len(books), Book.objects.count())
+ self.assertTrue(all(not book.selected for book in books))
+
+ books = Book.objects.annotate(
+ selected=ExpressionWrapper(Q(pk__in=Book.objects.none()), output_field=BooleanField())
+ )
+ self.assertEqual(len(books), Book.objects.count())
+ self.assertTrue(all(not book.selected for book in books))
+
def test_annotate_with_aggregation(self):
books = Book.objects.annotate(
is_book=Value(1, output_field=IntegerField()),