Fixed #32126 -- Fixed grouping by Case() annotation without cases.

Co-authored-by: Simon Charette <charettes@users.noreply.github.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/django/db/models/expressions.py b/django/db/models/expressions.py
index 43b8920d95..13918467ee 100644
--- a/django/db/models/expressions.py
+++ b/django/db/models/expressions.py
@@ -1068,6 +1068,11 @@ class Case(Expression):
             sql = connection.ops.unification_cast_sql(self.output_field) % sql
         return sql, sql_params
 
+    def get_group_by_cols(self, alias=None):
+        if not self.cases:
+            return self.default.get_group_by_cols(alias)
+        return super().get_group_by_cols(alias)
+
 
 class Subquery(Expression):
     """