| From: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Richard Guo <riguo(at)pivotal(dot)io>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Fix up grouping sets reorder |
| Date: | 2019-06-17 18:47:38 |
| Message-ID: | 87wohk124q.fsf@news-spur.riddles.org.uk |
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| Lists: | pgsql-hackers |
>>>>> "Andres" == Andres Freund <andres(at)anarazel(dot)de> writes:
>> During the reorder of grouping sets into correct prefix order, if
>> only one aggregation pass is needed, we follow the order of the
>> ORDER BY clause to the extent possible, to minimize the chance that
>> we add unnecessary sorts. This is implemented in
>> preprocess_grouping_sets --> reorder_grouping_sets.
Andres> Thanks for finding!
Andres> Andrew, could you take a look at that?
Yes.
--
Andrew (irc:RhodiumToad)
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