Re: ALTER TABLE on system catalogs

From: Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>
To: peter(dot)eisentraut(at)2ndquadrant(dot)com
Cc: andres(at)anarazel(dot)de, tgl(at)sss(dot)pgh(dot)pa(dot)us, michael(at)paquier(dot)xyz, pgsql-hackers(at)postgresql(dot)org
Subject: Re: ALTER TABLE on system catalogs
Date: 2019-03-19 11:00:01
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Sorry overlooked this.

At Thu, 14 Feb 2019 16:35:45 +0100, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> wrote in <84c6bcc4-026f-a44f-5726-e8035f4d197a(at)2ndquadrant(dot)com>
> On 08/02/2019 04:04, Kyotaro HORIGUCHI wrote:
> > By the way, I'm confused to see that attributes that don't want
> > to go external are marked as 'x' in system catalogs. Currently
> > (putting aside its necessity) the following operation ends with
> > successful attaching a new TOAST relation, which we really don't
> > want.
> >
> > ALTER TABLE pg_attribute ALTER COLUMN attrelid SET STORAGE plain;
> >
> > Might be silly, but couldn't we have another storage class? Say,
> > Compression, which means try compress but don't go external.
> That already exists: 'm': Value can be stored compressed inline

It works differently. 'm' doesn't prevent toast table from
creation, and 'c' does. But I agree that your patch fixes
that. My point was just seeming consistency in narrow area.

> I agree that it seems we should be using that for those tables that
> don't have a toast table. Maybe the genbki stuff could do it
> automatically for the appropriate catalogs.


Kyotaro Horiguchi
NTT Open Source Software Center

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