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In-Reply-To: 
 <CAFiTN-sL7MVgbWh-_2YkC-dtHjZUEk8u1rBicM2+WQiFAUjKjw@mail.gmail.com>
From: vignesh C <vignesh21@gmail.com>
Date: Mon, 15 Jun 2026 11:56:53 +0530
Message-ID: 
 <CALDaNm3en8sXkC952YyGONd-oQaH5Y7ww1WEe20D82p1E5RSFg@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: Dilip Kumar <dilipbalaut@gmail.com>
Cc: shveta malik <shveta.malik@gmail.com>,
 Amit Kapila <amit.kapila16@gmail.com>,
	Nisha Moond <nisha.moond412@gmail.com>, Peter Smith <smithpb2250@gmail.com>,
	Masahiko Sawada <sawada.mshk@gmail.com>,
	Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>,
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
Archived-At: 
 <https://www.postgresql.org/message-id/CALDaNm3en8sXkC952YyGONd-oQaH5Y7ww1WEe20D82p1E5RSFg%40mail.gmail.com>
Precedence: bulk

On Sat, 13 Jun 2026 at 15:46, Dilip Kumar <dilipbalaut@gmail.com> wrote:
>
> On Thu, Jun 11, 2026 at 5:53=E2=80=AFPM vignesh C <vignesh21@gmail.com> w=
rote:
> >
> > On Thu, 11 Jun 2026 at 10:44, Dilip Kumar <dilipbalaut@gmail.com> wrote=
:
> > >
> > > Please find the rebased patch
> > > 1. It includes the new 0005 patch for reporting errors for DDLs on cl=
t.
> > >
> > > Open comments:
> > > 1. Recent comments from Nisha and Shveta after v47 are still open
> > > 2. Vignesh's patch for "describe related" changes needs a rebase. Can
> > > you do that, Vignesh? Meanwhile, I will close all the open comments
> > > and try to share a new version by EOD today.
> >
> > Here is the rebased version of the patch attached.
>
> Please find attached the latest patch. I have reordered the series,
> moving 0006 to 0002, and updated the lock restrictions. We now allow
> ACCESS SHARE mode exclusively to ensure pg_dump can acquire its
> necessary locks, while blocking higher-level locks to prevent
> interference with insertions into the conflict log tables.

While reviewing operations on the pg_conflict schema, I noticed a few
behaviors that I wasn't sure were intentional.
1. REINDEX is allowed on conflict log tables
postgres=3D# REINDEX TABLE pg_conflict.pg_conflict_log_16404;
REINDEX

I was not sure whether allowing REINDEX on conflict log tables is
intentional, given that these are system-managed tables.

2. Views are disallowed, but functions are allowed
Creating a view in the pg_conflict schema is rejected:
postgres=3D# CREATE VIEW v1 AS
SELECT * FROM pg_conflict.pg_conflict_log_16435;
ERROR:  permission denied to create "pg_conflict.v1"
DETAIL:  Conflict schema modifications are currently disallowed.

However, creating a function in the same schema succeeds:
CREATE FUNCTION pg_conflict.get_conflict_count()
RETURNS bigint
LANGUAGE sql
AS $$
    SELECT count(*) FROM pg_conflict.pg_conflict_log_16404;
$$;
CREATE FUNCTION

I noticed similar behavior with the pg_toast schema as well, where
function creation is allowed:

CREATE FUNCTION pg_toast.get_toast_1213_count()
RETURNS bigint
LANGUAGE sql
AS $$
    SELECT count(*) FROM pg_toast.pg_toast_1213;
$$;
CREATE FUNCTION

I am not sure what the rationale is for permitting some object types
while rejecting others.

3. Functions can be created, but triggers cannot:
Although function creation succeeds, trigger creation on a conflict
log table is rejected:
CREATE TRIGGER conflict_audit
AFTER INSERT
ON pg_conflict.pg_conflict_log_16435
FOR EACH ROW
EXECUTE FUNCTION get_conflict_count();
ERROR:  permission denied: "pg_conflict_log_16435" is a conflict log table
DETAIL:  Conflict log tables are system-managed tables for logical
replication conflicts.

Again, I wasn't sure whether this distinction is intentional.

4. User-defined types and domains are allowed
CREATE TYPE pg_conflict.conflict_status AS ENUM ('ACTIVE', 'INACTIVE');
CREATE TYPE

CREATE DOMAIN pg_conflict.positive_int
AS integer
CHECK (VALUE > 0);
CREATE DOMAIN

I was also surprised that creating types and domains is permitted in
the pg_conflict schema.

Overall, I am having some difficulty understanding the rules governing
which operations are allowed and which are disallowed in the
pg_conflict namespace. If these behaviors are intentional, would it
make sense to document the supported and unsupported operations more
clearly? That would help avoid confusion for users.

Regards,
Vignesh