[1.9.x] Fixed #25506 -- Allowed filtering over a RawSQL annotation.

Co-Authored-By: Gavin Wahl <gwahl@fusionbox.com>

Backport of b971c1c from master

django/db/models/lookups.py

@@ -151,7 +151,7 @@ def process_lhs(self, compiler, connection, lhs=None):
         lhs_sql = connection.ops.field_cast_sql(
             db_type, field_internal_type) % lhs_sql
         lhs_sql = connection.ops.lookup_cast(self.lookup_name, field_internal_type) % lhs_sql
-        return lhs_sql, params
+        return lhs_sql, list(params)
 
     def as_sql(self, compiler, connection):
         lhs_sql, params = self.process_lhs(compiler, connection)

docs/releases/1.8.6.txt

@@ -17,3 +17,5 @@ Bugfixes
 
 * Fixed system check crash on ``ForeignKey`` to abstract model
   (:ticket:`25503`).
+
+* Allowed filtering over a ``RawSQL`` annotation (:ticket:`25506`).

tests/expressions/tests.py

@@ -57,6 +57,18 @@ def test_annotate_values_aggregate(self):
         )
         self.assertEqual(companies['result'], 2395)
 
+    def test_annotate_values_filter(self):
+        companies = Company.objects.annotate(
+            foo=RawSQL('%s', ['value']),
+        ).filter(foo='value').order_by('name')
+        self.assertQuerysetEqual(
+            companies, [
+                '<Company: Example Inc.>',
+                '<Company: Foobar Ltd.>',
+                '<Company: Test GmbH>',
+            ],
+        )
+
     def test_filter_inter_attribute(self):
         # We can filter on attribute relationships on same model obj, e.g.
         # find companies where the number of employees is greater