Chris Cogdon <ch...@cogdon.org> writes:
> Hi folks! Iâve 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
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