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Re: Column Filtering in Logical Replication

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: Rahila Syed <rahilasyed90@gmail.com>
Cc: Alvaro Herrera <alvherre@alvh.no-ip.org>, Tomas Vondra <tomas.vondra@enterprisedb.com>, Peter Smith <smithpb2250@gmail.com>, PostgreSQL-development <pgsql-hackers@postgresql.org>
Date: 2021-09-07T05:00:18Z
Lists: pgsql-hackers 
On Mon, Sep 6, 2021 at 9:25 PM Rahila Syed <rahilasyed90@gmail.com> wrote:
>
> On Mon, Sep 6, 2021 at 8:53 AM Amit Kapila <amit.kapila16@gmail.com> wrote:
>>
>
>> Did you give any thoughts to my earlier suggestion related to syntax [1]?
>>
>>
>> [1] - https://www.postgresql.org/message-id/CAA4eK1J9b_0_PMnJ2jq9E55bcbmTKdUmy6jPnkf1Zwy2jxah_g%40mail.gmail.com
>
>
> For future support to replicate all columns except (x,y,z), I think some optional keywords like
> COLUMNS NOT IN can be inserted between table name and (*columns_list*) as follows.
> ALTER PUBLICATION ADD TABLE tab_name [COLUMNS NOT IN] (x,y,z)
> I think this should be possible as a future addition to proposed syntax in the patch.
> Please let me know your opinion.
>

Right, I don't want you to implement that feature as part of this
patch but how about using COLUMNS or similar keyword in column filter
like ALTER PUBLICATION ADD TABLE tab_name COLUMNS (c1, c2, ...)? This
can make it easier to extend in the future.


-- 
With Regards,
Amit Kapila.

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