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: "tanghy.fnst@fujitsu.com" <tanghy.fnst@fujitsu.com>
Cc: "houzj.fnst@fujitsu.com" <houzj.fnst@fujitsu.com>, Alvaro Herrera <alvherre@alvh.no-ip.org>, Peter Smith <smithpb2250@gmail.com>, Euler Taveira <euler@eulerto.com>, Greg Nancarrow <gregn4422@gmail.com>, vignesh C <vignesh21@gmail.com>, Ajin Cherian <itsajin@gmail.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: 2022-01-20T12:52:39Z
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 Thu, Jan 20, 2022 at 5:03 PM tanghy.fnst@fujitsu.com
<tanghy.fnst@fujitsu.com> wrote:
>
> On Thu, Jan 20, 2022 9:13 AM houzj.fnst@fujitsu.com <houzj.fnst@fujitsu.com> wrote:
> > Attach the V68 patch set which addressed the above comments and changes.
> > The version patch also fix the error message mentioned by Greg[1]
> >
>
> I saw a problem about this patch, which is related to Replica Identity check.
>
> For example:
> -- publisher --
> create table tbl (a int);
> create publication pub for table tbl where (a>10) with (publish='delete');
> insert into tbl values (1);
> update tbl set a=a+1;
>
> postgres=# update tbl set a=a+1;
> ERROR:  cannot update table "tbl"
> DETAIL:  Column "a" used in the publication WHERE expression is not part of the replica identity.
>
> I think it shouldn't report the error because the publication didn't publish UPDATES.
>

Right, I also don't see any reason why an error should be thrown in
this case. The problem here is that the patch doesn't have any
correspondence between the pubaction and RI column validation for a
particular publication. I think we need to do that and cache that
information unless the publication publishes both updates and deletes
in which case it is okay to directly return invalid column in row
filter as we are doing now.

-- 
With Regards,
Amit Kapila.