| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
| Cc: | Justin Pryzby <pryzby(at)telsasoft(dot)com>, wenjing(at)gmail(dot)com, Andrew Bille <andrewbille(at)gmail(dot)com>, Tony Zhu <Tony(dot)zhu(at)ww-it(dot)cn>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: [Proposal] Global temporary tables |
| Date: | 2022-02-27 04:13:04 |
| Message-ID: | 20220227041304.mnimeqkhwktrjyht@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
Hi,
On 2022-02-27 04:17:52 +0100, Pavel Stehule wrote:
> > You redirect stats from pg_class and pg_statistics to a local hash table.
> > This is pretty hairy :(
As is I think the patch is architecturally completely unacceptable. Having
code everywhere to redirect to manually written in-memory catalog table code
isn't maintainable.
> > I guess you'd also need to handle pg_statistic_ext and ext_data.
> > pg_stats doesn't work, since the data isn't in pg_statistic - it'd need to
> > look
> > at pg_get_gtt_statistics.
>
> Without this, the GTT will be terribly slow like current temporary tables
> with a lot of problems with bloating of pg_class, pg_attribute and
> pg_depend tables.
I think it's not a great idea to solve multiple complicated problems at
once...
Greetings,
Andres Freund
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