| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Jeff Davis <pgsql(at)j-davis(dot)com> |
| Cc: | Corey Huinker <corey(dot)huinker(at)gmail(dot)com>, Nathan Bossart <nathandbossart(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Michael Paquier <michael(at)paquier(dot)xyz>, jian he <jian(dot)universality(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Stephen Frost <sfrost(at)snowman(dot)net>, Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>, Peter Smith <smithpb2250(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, alvherre(at)alvh(dot)no-ip(dot)org |
| Subject: | Re: Statistics Import and Export |
| Date: | 2025-03-06 18:23:40 |
| Message-ID: | 5ezgltxblbsaui74s6apjt2vqszjxjesufem7ecsgybio4xm43@gmcoxov6evzx |
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| Lists: | pgsql-hackers |
Hi,
On 2025-03-06 10:07:43 -0800, Jeff Davis wrote:
> On Thu, 2025-03-06 at 12:16 -0500, Andres Freund wrote:
> > I don't follow. We already have the tablenames, schemanames and oids
> > of the
> > to-be-dumped tables/indexes collected in pg_dump, all that's needed
> > is to send
> > a list of those to the server to filter there?
>
> Would it be appropriate to create a temp table? I wouldn't normally
> expect pg_dump to create temp tables, but I can't think of a major
> reason not to.
It doesn't work on a standby.
> If not, did you have in mind a CTE with a large VALUES expression, or
> just a giant IN() list?
An array, with a server-side unnest(), like we do in a bunch of other
places. E.g.
/* need left join to pg_type to not fail on dropped columns ... */
appendPQExpBuffer(q,
"FROM unnest('%s'::pg_catalog.oid[]) AS src(tbloid)\n"
"JOIN pg_catalog.pg_attribute a ON (src.tbloid = a.attrelid) "
"LEFT JOIN pg_catalog.pg_type t "
"ON (a.atttypid = t.oid)\n",
tbloids->data);
Greetings,
Andres Freund
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