| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, "Jonathan S(dot) Katz" <jkatz(at)postgresql(dot)org>, David Rowley <dgrowleyml(at)gmail(dot)com>, John Naylor <john(dot)naylor(at)enterprisedb(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Yura Sokolov <y(dot)sokolov(at)postgrespro(dot)ru>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Michael Paquier <michael(at)paquier(dot)xyz> |
| Subject: | Re: PG15 beta1 sort performance regression due to Generation context change |
| Date: | 2022-07-15 20:54:12 |
| Message-ID: | 3495693.1657918452@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Tomas Vondra <tomas(dot)vondra(at)enterprisedb(dot)com> writes:
> ... My personal opinion is that it's a rare regression. Other
> optimization patches have similar rare regressions, except that David
> spent so much time investigating this one it seems more serious.
Yeah, this. I fear we're making a mountain out of a molehill. We have
committed many optimizations that win on average but possibly lose
in edge cases, and not worried too much about it.
regards, tom lane
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