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: 2022-02-08T13:10:08Z
Lists: pgsql-hackers

Commits

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

  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 8, 2022 at 8:01 AM houzj.fnst@fujitsu.com
<houzj.fnst@fujitsu.com> wrote:
>
> >
> > 12. src/backend/replication/pgoutput/pgoutput.c - get_rel_sync_entry
> >
> > + /*
> > + * Initialize the row filter after getting the final publish_as_relid
> > + * as we only evaluate the row filter of the relation which we publish
> > + * change as.
> > + */
> > + pgoutput_row_filter_init(data, active_publications, entry);
> >
> > The comment "which we publish change as" seems strangely worded.
> >
> > Perhaps it should be:
> > "... only evaluate the row filter of the relation which being published."
>
> Changed.
>

I don't know if this change is an improvement. If you want to change
then I don't think 'which' makes sense in the following part of the
comment: "...relation which being published."

Few other comments:
====================
1. Can we save sending schema change messages if the row filter
doesn't match by moving maybe_send_schema after row filter checks?

2.
commit message/docs:
"The WHERE clause
only allows simple expressions that don't have user-defined functions,
user-defined operators, user-defined collations, non-immutable built-in
functions, or references to system columns."

"user-defined types" is missing in this sentence.

3.
+ /*
+ * For all the supported nodes, check the functions and collations used in
+ * the nodes.
+ */

Again 'types' is missing in this comment.

-- 
With Regards,
Amit Kapila.