| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Tomas Vondra <tv(at)fuzzy(dot)cz>, pgsql-hackers(at)lists(dot)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org, Melanie Plageman <melanieplageman(at)gmail(dot)com> |
| Subject: | Re: hashagg slowdown due to spill changes |
| Date: | 2020-06-15 06:09:55 |
| Message-ID: | e19a19bf2ec75db916ad85f324cb3596c4d8e196.camel@j-davis.com |
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| Lists: | pgsql-hackers |
On Sun, 2020-06-14 at 11:14 -0700, Andres Freund wrote:
> I'm somewhat inclined to think that we should revert 4cad2534da6 and
> then look at how precisely to tackle this in 14.
I'm fine with that.
> It'd probably make sense to request small tlists when the number of
> estimated groups is large, and not otherwise.
That seems like a nice compromise that would be non-invasive, at least
for create_agg_plan().
Regards,
Jeff Davis
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