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Re: Column Filtering in Logical Replication

Peter Eisentraut <peter.eisentraut@enterprisedb.com>

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From: Peter Eisentraut <peter.eisentraut@enterprisedb.com>
To: Amit Kapila <amit.kapila16@gmail.com>, Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Tomas Vondra <tomas.vondra@enterprisedb.com>, Rahila Syed <rahilasyed90@gmail.com>, Peter Smith <smithpb2250@gmail.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2021-12-17T07:03:33Z
Lists: pgsql-hackers 
On 17.12.21 05:47, Amit Kapila wrote:
> I think in the above sentence, you mean to say "dropped from the
> publication". So, IIUC, you are proposing that if one drops a column
> that was part of the column list of a relation in a publication, an
> error will be raised. Also, if the user specifies CASCADE in Alter
> Table ... Drop Column, then we drop the relation from publication. Is
> that right? BTW, this is somewhat on the lines of what row_filter
> patch is also doing where if the user drops the column that was part
> of row_filter for a relation in publication, we give an error and if
> the user tries to drop the column with CASCADE then the relation is
> removed from the publication.

That looks correct.  Consider how triggers behave: Dropping a column 
that a trigger uses (either in UPDATE OF or a WHEN condition) errors 
with RESTRICT and drops the trigger with CASCADE.

Commits

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

  1. Doc: Explain about Column List feature.

  2. Doc: fix column list vs. replica identity rules.

  3. Prohibit combining publications with different column lists.

  4. Fix the check to limit sync workers.

  5. Wait for subscription to sync in t/031_column_list.sql

  6. Move prattrs to the pg_publication_rel section in docs

  7. Allow specifying column lists for logical replication

  8. Fix row filters with multiple publications

  9. Fix publish_as_relid with multiple publications

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

  11. Add index on pg_publication_rel.prpubid

  12. Avoid using DefElemAction in AlterPublicationStmt

  13. Small cleanups related to PUBLICATION framework code

  14. Add PublicationTable and PublicationRelInfo structs

  15. Fix various concurrency issues in logical replication worker launching