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From: Ajin Cherian <itsajin@gmail.com>
Date: Tue, 24 Mar 2026 17:54:09 +1100
Message-ID: 
 <CAFPTHDb9ZiXzSu0N_1naOqAfLPWMOQV=o+WpL_EBLc5_5PEWvw@mail.gmail.com>
Subject: Re: Initial COPY of Logical Replication is too slow
To: Masahiko Sawada <sawada.mshk@gmail.com>
Cc: Jan Wieck <jan@wi3ck.info>, pgsql-hackers@lists.postgresql.org
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On Thu, Mar 19, 2026 at 10:30=E2=80=AFAM Masahiko Sawada <sawada.mshk@gmail=
.com> wrote:
>
> I've attached the patch to implement this idea. The patch still
> introduces a new function but it overloads
> pg_get_publication_tables(). We might be able to handle different
> input (array or text) in pg_get_publication_tables() better, but it's
> enough for discussion at least.
>

The patch looks like a good performance improvement. Some minor comments:

1. src/test/regress/expected/publication.out

+-- Clean up
+DROP FUNCTION test_gpt(text[], relname);
+ERROR:  type "relname" does not exist

Cleanup actually fails. Second parameter should be text, not relname.

2. src/include/catalog/pg_proc.dat

+  proallargtypes =3D> '{text,oid,oid,oid,int2vector,pg_node_tree}',
+  proargmodes =3D> '{i,i,o,o,o,o}',
+  proargnames =3D> '{pubname,relid,pubid,relid,attrs,qual}',

Having two arguments with the same name "relid" seems odd, although
one is input and other is output parameter, how about calling input
parameter as target_relid?

3. src/backend/replication/logical/tablesync.c

+
+        if (server_version >=3D 190000)
+        {
+            /*
+             * We can pass relid to pg_get_publication_table_info() since
+             * version 19.
+             */
+            appendStringInfo(&cmd,
+                             "SELECT DISTINCT"

In multiple places in the code pg_get_publication_table_info() is
used, instead of pg_get_publication_tables()

thanks,
Ajin Cherian
Fujitsu Australia