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From: shveta malik <shveta.malik@gmail.com>
Date: Fri, 2 Jan 2026 12:06:09 +0530
Message-ID: <CAJpy0uD6fTEUYJx3+yDbvB=VW7c5AaGoeSd7iwHdYYO=kYGn3g@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: vignesh C <vignesh21@gmail.com>
Cc: Dilip Kumar <dilipbalaut@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>, 
	Masahiko Sawada <sawada.mshk@gmail.com>, 
	Bharath Rupireddy <bharath.rupireddyforpostgres@gmail.com>, 
	PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, shveta malik <shveta.malik@gmail.com>
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Precedence: bulk

On Fri, Dec 26, 2025 at 8:58=E2=80=AFPM vignesh C <vignesh21@gmail.com> wro=
te:
>
>
> Here is a rebased version of the remaining patches.
>

Thank You Vignesh. Please find a few comments on 004:


1)
IIUC, SubscriptionConflictrelIndexId is an unique index on sub-oid and
conf-relid, but we use it only on relid as key. Why didn't  we create
it only on 'conf-relid' alone? Using a composite unique index is
guaranteed to give unique row only when all keys are used, but for a
single key, a unique row is not guaranteed. In our case, it will be a
unique row as conflict-relid is not shared, but still as an overall
general concept, it may not be.

2)
IsConflictLogTable():
+ if (OidIsValid(subform->subconflictlogrelid))

Do we need this check? Since we=E2=80=99ve already performed an index acces=
s
using subconflictlogrelid as the key, isn=E2=80=99t it guaranteed to always=
 be
valid?

3)
Please update the commit message to indicate that this patch makes CLT
publishable if a publication is explicitly created on it, else few
changes become very confusing due to unclear intent.

4)
pg_relation_is_publishable():

  /* Subscription conflict log tables are not published */
- result =3D is_publishable_class(relid, (Form_pg_class) GETSTRUCT(tuple)) =
&&
- !IsConflictLogTable(relid);

Comment should be removed too.

5)
We need to remove below comment:

 * Note: Conflict log tables are not publishable.  However, we intentionall=
y
 * skip this check here because this function is called for every change an=
d
 * performing this check during every change publication is costly.  To ens=
ure
 * unpublishable entries are ignored without incurring performance overhead=
,
 * tuples inserted into the conflict log table uses the HEAP_INSERT_NO_LOGI=
CAL
 * flag.  This allows the decoding layer to bypass these entries automatica=
lly.
 */
bool
is_publishable_relation(Relation rel)

6)
get_rel_sync_entry:
+ /* is this relation used for conflict logging? */
+ isconflictlogrel =3D IsConflictLogTable(relid);

Shall we add a comment indicating the intent of change in this
function. Something like:

/*
 * Check whether this is a conflict log table. If so, avoid publishing it v=
ia
 * FOR ALL TABLES or FOR TABLES IN SCHEMA publications, but still allow it
 * to be published through a publication explicitly created for this table.
 */

thanks
Shveta