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Re: Pgoutput not capturing the generated columns

Amit Kapila <amit.kapila16@gmail.com>

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From: Amit Kapila <amit.kapila16@gmail.com>
To: Peter Smith <smithpb2250@gmail.com>
Cc: Shubham Khanna <khannashubham1197@gmail.com>, vignesh C <vignesh21@gmail.com>, Masahiko Sawada <sawada.mshk@gmail.com>, Rajendra Kumar Dangwal <dangwalrajendra888@gmail.com>, pgsql-hackers@lists.postgresql.org, euler@eulerto.com
Date: 2024-10-29T06:28:24Z
Lists: pgsql-hackers 
On Tue, Oct 29, 2024 at 11:30 AM Peter Smith <smithpb2250@gmail.com> wrote:
> ======
> src/backend/replication/logical/tablesync.c
>
> fetch_remote_table_info:
>
> 2.
> +fetch_remote_table_info(char *nspname, char *relname, LogicalRepRelation *lrel,
> + List **qual, bool *remotegencolpresent)
>
> The name 'remotegencolpresent' sounds like it means a generated col is
> present in the remote table, but don't we only care when it is being
> published? So, would a better parameter name be more like
> 'remote_gencol_published'?
>

I feel no need to add a 'remote' to this variable name as the function
name itself clarifies the same. Both in the function definition and at
the caller site, we can name it 'gencol_published'.

> ~~~
>
> 3.
> Would it be better to introduce a new human-readable variable like:
> bool check_for_published_gencols = (server_version >= 180000);
>
> because then you could use that instead of having the 180000 check in
> multiple places.
>

It is better to add a comment because it makes this part of the code
difficult to enhance in the same version (18) if required.

> ~~~
>
> 4.
> -   lengthof(attrRow), attrRow);
> +   server_version >= 180000 ? lengthof(attrRow) : lengthof(attrRow) -
> 1, attrRow);
>
> If you wish, that length calculation could be written more concisely like:
> lengthof(attrow) - (server_version >= 180000 ? 0 : 1)
>

The current way of the patch seems easier to follow.

-- 
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: 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.