Horton

Re: row filtering for logical replication

Peter Smith <smithpb2250@gmail.com>

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From: Peter Smith <smithpb2250@gmail.com>
To: vignesh C <vignesh21@gmail.com>
Cc: Ajin Cherian <itsajin@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>, "houzj.fnst@fujitsu.com" <houzj.fnst@fujitsu.com>, Greg Nancarrow <gregn4422@gmail.com>, "tanghy.fnst@fujitsu.com" <tanghy.fnst@fujitsu.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: 2021-11-30T22:21:30Z
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 Tue, Nov 30, 2021 at 9:34 PM vignesh C <vignesh21@gmail.com> wrote:
>
> 3) Can a user remove the row filter without removing the table from
> the publication after creating the publication or should the user drop
> the table and add the table in this case?
>

AFAIK to remove an existing filter use ALTER PUBLICATION ... SET TABLE
but do not specify any filter.
For example,

test_pub=# create table t1(a int primary key);
CREATE TABLE
test_pub=# create publication p1 for table t1 where (a > 1);
CREATE PUBLICATION
test_pub=# create publication p2 for table t1 where (a > 2);
CREATE PUBLICATION
test_pub=# \d+ t1
                                           Table "public.t1"
 Column |  Type   | Collation | Nullable | Default | Storage |
Compression | Stats target | Description
--------+---------+-----------+----------+---------+---------+-------------+--------------+-------------
 a      | integer |           | not null |         | plain   |
    |              |
Indexes:
    "t1_pkey" PRIMARY KEY, btree (a)
Publications:
    "p1" WHERE ((a > 1))
    "p2" WHERE ((a > 2))
Access method: heap

test_pub=# alter publication p1 set table t1;
ALTER PUBLICATION
test_pub=# \d+ t1
                                           Table "public.t1"
 Column |  Type   | Collation | Nullable | Default | Storage |
Compression | Stats target | Description
--------+---------+-----------+----------+---------+---------+-------------+--------------+-------------
 a      | integer |           | not null |         | plain   |
    |              |
Indexes:
    "t1_pkey" PRIMARY KEY, btree (a)
Publications:
    "p1"
    "p2" WHERE ((a > 2))
Access method: heap

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