Horton

Re: row filtering for logical replication

Peter Smith <smithpb2250@gmail.com>

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From: Peter Smith <smithpb2250@gmail.com>
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: "houzj.fnst@fujitsu.com" <houzj.fnst@fujitsu.com>, Ajin Cherian <itsajin@gmail.com>, Greg Nancarrow <gregn4422@gmail.com>, Dilip Kumar <dilipbalaut@gmail.com>, Euler Taveira <euler@eulerto.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: 2021-11-19T00:05:31Z
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 Mon, Nov 15, 2021 at 9:31 PM Amit Kapila <amit.kapila16@gmail.com> wrote:
>
...
>
> Few comments on the latest set of patches (v39*)
> =======================================
> 0001*
> 1.
>  ObjectAddress
> -publication_add_relation(Oid pubid, PublicationRelInfo *targetrel,
> +publication_add_relation(Oid pubid, PublicationRelInfo *pri,
>   bool if_not_exists)
>  {
>   Relation rel;
>   HeapTuple tup;
>   Datum values[Natts_pg_publication_rel];
>   bool nulls[Natts_pg_publication_rel];
> - Oid relid = RelationGetRelid(targetrel->relation);
> + Relation    targetrel = pri->relation;
>
> I don't think such a renaming (targetrel-->pri) is warranted for this
> patch. If we really want something like this, we can probably do it in
> a separate patch but I suggest we can do that as a separate patch.
>

The name "targetrel" implies it is a Relation. (and historically, this
arg once was "Relation *targetrel").

Then when the PublicationRelInfo struct was introduced the arg name
was not changed and it became "PublicationRelInfo *targetrel". But at
that time PublicationRelInfo was just a simple wrapper for a Relation
so that was probably ok.

But now this Row-Filter patch has added more new members to
PublicationRelInfo, so IMO the name change is helpful otherwise it
seems misleading to continue calling it like it was still just a
Relation.

------
Kind Regards,
Peter Smith.
Fujitsu Australia