| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com> |
| Cc: | Simon Riggs <simon(dot)riggs(at)enterprisedb(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Parameter for planner estimate of recursive queries |
| Date: | 2022-01-28 14:07:32 |
| Message-ID: | CA+TgmoaGDw2baysiK+qqL+c3roa-9cPSvJ_Kwdgx7RoPQR0TaA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, Jan 25, 2022 at 4:44 AM Peter Eisentraut
<peter(dot)eisentraut(at)enterprisedb(dot)com> wrote:
> On the one hand, this smells like a planner hint. But on the other
> hand, it doesn't look like we will come up with proper graph-aware
> selectivity estimation system any time soon, so just having all graph
> OLTP queries suck until then because the planner hint is hardcoded
> doesn't seem like a better solution. So I think this setting can be ok.
I agree. It's a bit lame, but seems pretty harmless, and I can't see
us realistically doing a lot better with any reasonable amount of
work.
--
Robert Haas
EDB: http://www.enterprisedb.com
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