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In-Reply-To: 
 <CAA4eK1L7tSG6wEErAPd4MGO7yTXd-7fcWG74dgMqQ0Wz2Gw+hQ@mail.gmail.com>
From: Dilip Kumar <dilipbalaut@gmail.com>
Date: Thu, 25 Jun 2026 18:30:16 +0530
Message-ID: 
 <CAFiTN-tO8a724J0sL=TtjTnkAp0Ea7H3cZqjhb94nwX=3nd1ZQ@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: vignesh C <vignesh21@gmail.com>, Nisha Moond <nisha.moond412@gmail.com>,
	shveta malik <shveta.malik@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/CAFiTN-tO8a724J0sL%3DTtjTnkAp0Ea7H3cZqjhb94nwX%3D3nd1ZQ%40mail.gmail.com>
Precedence: bulk

On Thu, Jun 25, 2026 at 4:57=E2=80=AFPM Amit Kapila <amit.kapila16@gmail.co=
m> wrote:
>
> On Thu, Jun 25, 2026 at 10:34=E2=80=AFAM vignesh C <vignesh21@gmail.com> =
wrote:
> >
> > On Wed, 24 Jun 2026 at 19:27, Dilip Kumar <dilipbalaut@gmail.com> wrote=
:
> > >
> >
> > 2) jsonb supports indexing, whereas json does not. Was json chosen
> > here because inserts are faster due to the lack of parsing and binary
> > conversion?
> >
>
> I think it is more because the local/remote tuples are usually data
> which we want users to see as it was in original tables, using jsonb
> can change the ordering of columns or remove some space etc. We can
> add a comment on the lines of: "preserve the exact tuple
> representation (column order, formatting) for the audit record; the
> value is natively json so this avoids a per-conflict conversion". Now,
> this is true for tuple data but I am not so sure if the same thing
> applies to the replica_identity column in CLT. Would users ever want
> to query using ORDER/GROUP BY on replica_identity or use DISTINCT on
> it, because if that is possible then the current schema would result
> into ERROR as follows:
> postgres=3D# select * from pg_conflict.pg_conflict_log_16394 order by
> replica_identity;
> ERROR:  could not identify an ordering operator for type json
>
> This needs more thoughts from the perspective of how users would like
> to fetch the data.
>
> Few other comments:
> * errdetail("Conflict log tables are system-managed and only support
> cleanup via DELETE or TRUNCATE.")
>
> In the above message 'via' sounds a bit odd, can we instead use
> 'using' aka "Conflict log tables are system-managed and only support
> cleanup using DELETE or TRUNCATE."

Okay

> 2.
> @@ -2482,6 +2681,8 @@ DropSubscription(DropSubscriptionStmt *stmt,
> bool isTopLevel)
>   deleteDependencyRecordsFor(SubscriptionRelationId, subid, false);
>   deleteSharedDependencyRecordsFor(SubscriptionRelationId, subid, 0);
>
> + drop_sub_conflict_log_table(subid, subname, subconflictlogrelid);
>
> It would be better to drop the table before cleaning up the dependency
> record. Right now, it is okay even in current order because dependency
> removal is trying to remove where subid is depender.

So whats your suggestion change it now or not?  I feel either way is fine.

> Apart from above, attached contains a cosmetic/comment improvement patch.

Okay, I will merge


--=20
Regards,
Dilip Kumar
Google