Horton

Re: row filtering for logical replication

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: "houzj.fnst@fujitsu.com" <houzj.fnst@fujitsu.com>
Cc: Peter Smith <smithpb2250@gmail.com>, Alvaro Herrera <alvherre@alvh.no-ip.org>, Euler Taveira <euler@eulerto.com>, Greg Nancarrow <gregn4422@gmail.com>, vignesh C <vignesh21@gmail.com>, Ajin Cherian <itsajin@gmail.com>, "tanghy.fnst@fujitsu.com" <tanghy.fnst@fujitsu.com>, Dilip Kumar <dilipbalaut@gmail.com>, Rahila Syed <rahilasyed90@gmail.com>, Peter Eisentraut <peter.eisentraut@enterprisedb.com>, Önder Kalacı <onderkalaci@gmail.com>, japin <japinli@hotmail.com>, Michael Paquier <michael@paquier.xyz>, David Steele <david@pgmasters.net>, Craig Ringer <craig@2ndquadrant.com>, Amit Langote <amitlangote09@gmail.com>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2022-02-01T05:28:59Z
Lists: pgsql-hackers

Commits

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  1. Release cache tuple when no longer needed

  2. Add some additional tests for row filters in logical replication.

  3. Fix one of the tests introduced in commit 52e4f0cd47.

  4. Allow specifying row filters for logical replication of tables.

  5. Move scanint8() to numutils.c

  6. Replace Test::More plans with done_testing

  7. Reduce relcache access in WAL sender streaming logical changes

  8. Small cleanups related to PUBLICATION framework code

  9. Add a view to show the stats of subscription workers.

  10. Allow publishing the tables of schema.

  11. Doc: improve documentation of CREATE/ALTER SUBSCRIPTION.

  12. Add PublicationTable and PublicationRelInfo structs

  13. Remove unused argument "txn" in maybe_send_schema().

  14. Add prepare API support for streaming transactions in logical replication.

  15. Unify PostgresNode's new() and get_new_node() methods

  16. Use l*_node() family of functions where appropriate

  17. Add support for prepared transactions to built-in logical replication.

  18. Restore the portal-level snapshot after procedure COMMIT/ROLLBACK.

  19. Rename a parse node to be more general

  20. Remove unused column atttypmod from initial tablesync query

  21. SEARCH and CYCLE clauses

On Tue, Feb 1, 2022 at 9:15 AM houzj.fnst@fujitsu.com
<houzj.fnst@fujitsu.com> wrote:
>
> On Monday, January 31, 2022 9:02 PM Amit Kapila <amit.kapila16@gmail.com>
> >
>
> > 3.
> > + /* row filter (if any) */
> > + if (pset.sversion >= 150000)
> > + {
> > + if (!PQgetisnull(result, i, 1))
> > + appendPQExpBuffer(&buf, " WHERE %s", PQgetvalue(result, i, 1)); }
> >
> > I don't think we need this version check if while forming query we use NULL as
> > the second column in the corresponding query for v < 150000.
>
> Changed.
>

But, I don't see a corresponding change in the else part of the query:
else
{
printfPQExpBuffer(&buf,
  "SELECT pubname\n"
  "FROM pg_catalog.pg_publication p\n"
  "JOIN pg_catalog.pg_publication_rel pr ON p.oid = pr.prpubid\n"
  "WHERE pr.prrelid = '%s'\n"
  "UNION ALL\n"
  "SELECT pubname\n"
  "FROM pg_catalog.pg_publication p\n"
  "WHERE p.puballtables AND pg_catalog.pg_relation_is_publishable('%s')\n"
  "ORDER BY 1;",
  oid, oid);
}

Don't we need to do that to keep it working with previous versions?

-- 
With Regards,
Amit Kapila.