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In-Reply-To: 
 <CALDaNm0mSLV3R2eNgCvfJ4i6pbFnDwFUGM=Zrikh61XtaR9PSw@mail.gmail.com>
From: shveta malik <shveta.malik@gmail.com>
Date: Tue, 26 May 2026 15:08:19 +0530
Message-ID: 
 <CAJpy0uDzEW7hmUXHyApUx-7D10wvw8gJiRjHxkuRU+QOdAeMaA@mail.gmail.com>
Subject: Re: Proposal: Conflict log history table for Logical Replication
To: vignesh C <vignesh21@gmail.com>
Cc: Nisha Moond <nisha.moond412@gmail.com>,
 Peter Smith <smithpb2250@gmail.com>,
	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 <shvetamalik@gmail.com>
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Archived-At: 
 <https://www.postgresql.org/message-id/CAJpy0uDzEW7hmUXHyApUx-7D10wvw8gJiRjHxkuRU%2BQOdAeMaA%40mail.gmail.com>
Precedence: bulk

On Mon, May 25, 2026 at 10:13=E2=80=AFAM vignesh C <vignesh21@gmail.com> wr=
ote:
>
>
> Thanks for the comments, the attached v39 version patch has the
> changes for the same.
>

I have not yet looked at v40, but please find a few ocmments on
v39-0001 and 0002 merged together.

1)
heap_create:
+ errdetail("Conflict schema modifications are currently disallowed.")));
LookupCreationNamespace:
+ errmsg("cannot move objects into or out of the pg_conflict schema")));

Can we make it same through-out, either we use 'Conflict schema' at
both the places or pg_conflict schema.  Since in these 2 functions, in
previous messages, we are using names like 'System catalog', 'TOAST
schema' etc, I think we can use Conflict schema at both the places.
What do others think on this?


2)
drop_subscription_dependencies():

+ conflictrelname =3D get_rel_name(subconflictlogrelid);

We can actually have a sanity check that we got the CLT using the relid.
Assert(conflictrelname !=3D NULL);

3)
+ /*
+ * Special handling for the JSON array type for proper
+ * TupleDescInitEntry call.
+ */
+ if (type_oid =3D=3D JSONARRAYOID)
+ type_oid =3D get_array_type(JSONOID);

Why do we have this special handling? Do we expect that 'type_oid' can
be different from JSONARRAYOID if we use get_array_type? On debugging,
I found it to be same pre and post get_array_type()

4)
Do we need to have CommandCounterIncrement() after
heap_create_with_catalog() in create_conflict_log_table()? I think
even if we are not doing any table_open etc for CLT in same
transaction, we should call CommandCounterIncrement() (to be
consistent with other such calls of heap_create_with_catalog and to
make it future proof). Thoughts?

thanks
Shveta