Re: Pgoutput not capturing the generated columns

From: Ajin Cherian <itsajin(at)gmail(dot)com>
To: Peter Smith <smithpb2250(at)gmail(dot)com>
Cc: vignesh C <vignesh21(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Shubham Khanna <khannashubham1197(at)gmail(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Rajendra Kumar Dangwal <dangwalrajendra888(at)gmail(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org, euler(at)eulerto(dot)com
Subject: Re: Pgoutput not capturing the generated columns
Date: 2024-10-31 11:14:37
Message-ID: CAFPTHDbPx=wonW3Ny1WA5_dET_EBtw1sZEMSU4j4xpSmxrhONQ@mail.gmail.com
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On Thu, Oct 31, 2024 at 9:55 PM Ajin Cherian <itsajin(at)gmail(dot)com> wrote:

> I ran some tests and verified that the patch works with previous versions
> of PG12 and PG17
> 1. Verified with publications with generated columns and without generated
> columns on patched code and subscriptions on PG12 and PG17
> Observations:
> a. If publication is created with publish_generated_columns=true or
> with generated columns mentioned explicitly, then tablesync will not copy
> generated columns but post tablesync the generated columns are replicated
> b. Column list override (publish_generated_columns=false) behaviour
>
> These seem expected.
>
>
Currently the documentation does not talk about this behaviour, I suggest
this be added similar to how such a behaviour was documented when the
original row-filter version was committed.
Suggestion:
"If a subscriber is a pre-18 version, the initial table synchronization
won't publish generated columns even if they are defined in the publisher."

regards,
Ajin Cherian
Fujitsu Australia

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