Refs #32786 -- Made query clear ordering when ordered combined queryset is used in subquery on Oracle.

django/db/backends/oracle/features.py

@@ -116,11 +116,6 @@ class DatabaseFeatures(BaseDatabaseFeatures):
             "migrations.test_operations.OperationTests."
             "test_alter_field_pk_fk_db_collation",
         },
-        "Oracle raises an error when a subquery contains unnecessary ORDER BY "
-        "clause (#32786).": {
-            "queries.test_qs_combinators.QuerySetSetOperationTests."
-            "test_union_in_with_ordering",
-        },
     }
     django_test_expected_failures = {
         # A bug in Django/cx_Oracle with respect to string handling (#23843).

django/db/models/sql/query.py

@@ -1178,6 +1178,8 @@ class Query(BaseExpression):
             and not connection.features.ignores_unnecessary_order_by_in_subqueries
         ):
             self.clear_ordering(force=False)
+            for query in self.combined_queries:
+                query.clear_ordering(force=False)
         sql, params = self.get_compiler(connection=connection).as_sql()
         if self.subquery:
             sql = "(%s)" % sql