Horton
Menu

Re: Support logical replication of DDLs

Bruce Momjian <bruce@momjian.us>

View thread
From: Bruce Momjian <bruce@momjian.us>
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: Masahiko Sawada <sawada.mshk@gmail.com>, Vitaly Davydov <v.davydov@postgrespro.ru>, pgsql-hackers@lists.postgresql.org
Date: 2026-02-16T15:16:56Z
Lists: pgsql-hackers, pgsql-general 
On Mon, Feb 16, 2026 at 03:24:16PM +0530, Amit Kapila wrote:
> On Fri, Feb 13, 2026 at 3:42 AM Bruce Momjian <bruce@momjian.us> wrote:
> > pg_upgrade had a similar challenge, and I found that pushing as much of
> > the changes _out_ of pg_upgrade and to other parts of the system, e.g,,
> > pg_dump, was a big help.  I am not sure if that is possible for
> > replicated DDL, but if it is, I would pursue it.
> >
> 
> The other reason to pursue a deparsing approach is to allow "Schema
> and Object Redirection" between source and target. For example, users
> may want to redirect operations from a source object (e.g.,
> HR.ACCOUNTS on the source) to a different target object (e.g.,
> HR_BACKUP.ACCT on the target). Many people in the past supported such
> flexibility in DDL replication which is one of the reasons we pursued
> a deparsing approach in the past though that project/approach is
> paused for the time being. I admit that there were many unresolved
> challenges apart from the maintenance part of that approach.

I understand the desire to get two features from one set of changes, but
taking one hard feature and trying to get a second one accomplished
usually, for me, ends in failure.

-- 
  Bruce Momjian  <bruce@momjian.us>        https://momjian.us
  EDB                                      https://enterprisedb.com

  Do not let urgent matters crowd out time for investment in the future.

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Add a run_as_owner option to subscriptions.

  2. Refactor pgoutput_change().

  3. Print the correct aliases for DML target tables in ruleutils.

  4. Fix object identity string for transforms

  5. Add grantable MAINTAIN privilege and pg_maintain role.

  6. Get rid of recursion-marker values in enum AlterTableType

  7. Release cache tuple when no longer needed

  8. Empty search_path in logical replication apply worker and walsender.

  9. Refactor format_type APIs to be more modular

  10. Use wrappers of PG_DETOAST_DATUM_PACKED() more.