Fixed #31251 -- Disabled grouping by OuterRef() annotation.

django/db/models/expressions.py

@@ -562,6 +562,9 @@ class ResolvedOuterRef(F):
     def relabeled_clone(self, relabels):
         return self
 
+    def get_group_by_cols(self, alias=None):
+        return []
+
 
 class OuterRef(F):
     def resolve_expression(self, *args, **kwargs):

tests/expressions/tests.py

@@ -687,6 +687,14 @@ class BasicExpressionsTests(TestCase):
             [self.foobar_ltd.ceo],
         )
 
+    def test_subquery_group_by_outerref_in_filter(self):
+        inner = Company.objects.annotate(
+            employee=OuterRef('pk'),
+        ).values('employee').annotate(
+            min_num_chairs=Min('num_chairs'),
+        ).values('ceo')
+        self.assertIs(Employee.objects.filter(pk__in=Subquery(inner)).exists(), True)
+
     def test_case_in_filter_if_boolean_output_field(self):
         is_ceo = Company.objects.filter(ceo=OuterRef('pk'))
         is_poc = Company.objects.filter(point_of_contact=OuterRef('pk'))