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Changes between Version 3 and Version 4 of Ticket #33050

-              v3
+              v4
 can solve the problem I think.
+my current monkey-patching code is,
+{{{
+from django.db.models.sql.query import Query
+old_get_aggregation = Query.get_aggregation
+def get_aggregation(self, using, added_aggregate_names):
+    original_select_related_values = {}
+    for combined_query in self.combined_queries:
+        original_select_related_values[combined_query] = combined_query.select_related
+        combined_query.select_related = False
+    result = old_get_aggregation(self, using, added_aggregate_names)
+    for combined_query in self.combined_queries:
+        combined_query.select_related = original_select_related_values[combined_query]
+    return result
+Query.get_aggregation = get_aggregation
+}}}
 reproduced on on 3.2.5/3.2.6