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In-Reply-To: 
 <CAHut+PtE6TgoxYcKGB++TR_XRZmRUcHXq5VGyAOQfxhprkpapw@mail.gmail.com>
From: vignesh C <vignesh21@gmail.com>
Date: Thu, 21 May 2026 12:41:03 +0530
Message-ID: 
 <CALDaNm1z-=vzahdx2A5oHc66AiXJwGCuq3Pww3ieQEMz+y1yXw@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: Peter Smith <smithpb2250@gmail.com>
Cc: Shlok Kyal <shlok.kyal.oss@gmail.com>,
 Dilip Kumar <dilipbalaut@gmail.com>,
	Nisha Moond <nisha.moond412@gmail.com>,
 Amit Kapila <amit.kapila16@gmail.com>,
	shveta malik <shveta.malik@gmail.com>,
 Masahiko Sawada <sawada.mshk@gmail.com>,
	Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 shveta malik <shvetamalik@gmail.com>
Content-Type: text/plain; charset="UTF-8"
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Archived-At: 
 <https://www.postgresql.org/message-id/CALDaNm1z-%3Dvzahdx2A5oHc66AiXJwGCuq3Pww3ieQEMz%2By1yXw%40mail.gmail.com>
Precedence: bulk

On Thu, 21 May 2026 at 05:32, Peter Smith <smithpb2250@gmail.com> wrote:
>
> On Wed, May 20, 2026 at 8:50=E2=80=AFPM Shlok Kyal <shlok.kyal.oss@gmail.=
com> wrote:
> ..
> > Comments for 0002:
> > 2. We can rename the schema pg_conflict to a different schema name.
> > Is it ok to hardcode the schema name to 'pg_conflict'?
> > -                errmsg("cannot move objects into or out of CONFLICT sc=
hema")));
> > +                errmsg("cannot move objects into or out of
> > pg_conflict schema")));
> >
> > Example:
> > postgres=3D# ALTER SCHEMA pg_conflict RENAME TO sc1;
> > ALTER SCHEMA
> > postgres=3D# ALTER TABLE t2 SET SCHEMA sc1;
> > ERROR:  cannot move objects into or out of pg_conflict schema
> >
>
> Yikes!
>
> I am not sure that the error message is the problem here. There are
> worse things that are similar to this. e.g. I found that you can do
> the same trick of renaming the 'pg_catalog' schema, and it breaks
> anything that refers to that schema by name -- all the internal SQL!!
>
> test_pub=3D# ALTER SCHEMA pg_catalog RENAME TO mycatalog;
> ALTER SCHEMA
> test_pub=3D# \dRp+
> ERROR:  relation "pg_catalog.pg_publication" does not exist
> LINE 9: FROM pg_catalog.pg_publication
>              ^

I noticed this behavior with several other commands as well. For example:
postgres=3D# ALTER SCHEMA pg_catalog RENAME TO test;
ALTER SCHEMA
postgres=3D# \d
ERROR:  relation "pg_catalog.pg_class" does not exist
LINE 6: FROM pg_catalog.pg_class c
             ^
postgres=3D# \dn
ERROR:  relation "pg_catalog.pg_namespace" does not exist
LINE 4: FROM pg_catalog.pg_namespace n
             ^

I observed similar behavior when creating a table in the renamed schema:
postgres=3D# CREATE TABLE test.t1(c1 int);
ERROR:  schema "pg_catalog" does not exist
LINE 1: CREATE TABLE test.t1(c1 int);
                     ^

Given that this appears to be a broader issue related to renaming
pg_catalog, I think we can skip handling this case for now. If we
decide to address it, it would be better to handle it together with
the general pg_catalog rename behavior.

Regards,
Vignesh