Chris Cogdon <chris@xxxxxxxxxx> writes: > Hi folks! Iâ??ve a query where adding a rollup to the group by switches to > GroupAggregate unexpectedly, where the standard GROUP BY uses > HashAggregate. The current implementation of rollup doesn't support using hashed aggregation. I don't know if that's for lack of round tuits or because it's actually hard, but it's not the planner's fault. regards, tom lane -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
