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Re: Pgoutput not capturing the generated columns

Peter Smith <smithpb2250@gmail.com>

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From: Peter Smith <smithpb2250@gmail.com>
To: Amit Kapila <amit.kapila16@gmail.com>
Cc: Masahiko Sawada <sawada.mshk@gmail.com>, Shubham Khanna <khannashubham1197@gmail.com>, vignesh C <vignesh21@gmail.com>, Rajendra Kumar Dangwal <dangwalrajendra888@gmail.com>, pgsql-hackers@lists.postgresql.org, euler@eulerto.com
Date: 2024-10-23T06:55:55Z
Lists: pgsql-hackers 
On Wed, Oct 23, 2024 at 5:21 PM Amit Kapila <amit.kapila16@gmail.com> wrote:

> Additional comment on the 0003 patch
> +# =============================================================================
> +# Misc test.
> +#
> +# A "normal -> generated" replication.
> +#
> +# In this test case we use DROP EXPRESSION to change the subscriber generated
> +# column into a normal column, then verify replication works ok.
> +# =============================================================================
>
> In patch 0003, why do we have the above test? This doesn't seem to be
> directly related to this patch.
>
> --

Perhaps the test should be turned around, to test this feature more directly...

e.g. Replication of table tab(a int, b int) ==>  tab(a int, b int, c int)

test_pub=# create table tab(a int, b int);

then, dynamically add a generated column "c" to the publisher table
test_pub=# alter table tab add column c int GENERATED ALWAYS AS (a + b) STORED;
test_pub=# insert into tab values (1,2);

then, verify that replication works for the newly added generated
column "c" to the existing normal column "c" at the subscriber.

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

Commits

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  1. Doc: Generated column replication.

  2. Rename pubgencols_type to pubgencols in pg_publication.

  3. Doc: Fix column name in pg_publication catalog.

  4. Fix buildfarm failure introduced by commit e65dbc9927.

  5. Change publication's publish_generated_columns option type to enum.

  6. Fix \dRp+ output when describing publications with a lower server version.

  7. Replicate generated columns when 'publish_generated_columns' is set.

  8. Doc: Update the behavior of generated columns in Logical Replication.

  9. Replicate generated columns when specified in the column list.

  10. Doc: Generated columns are skipped for logical replication.