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From: Alexander Korotkov <aekorotkov@gmail.com>
Date: Tue, 30 Jun 2026 14:06:53 +0300
Message-ID: 
 <CAPpHfdvwtUvVyE7cvSsvEB_1gAs8XM0mX_CSRooE8sXoO82DtA@mail.gmail.com>
Subject: Re: Add SPLIT PARTITION/MERGE PARTITIONS commands
To: Dmitry Koval <d.koval@postgrespro.ru>
Cc: Pavel Borisov <pashkin.elfe@gmail.com>,
 Justin Pryzby <pryzby@telsasoft.com>,
	pgsql-hackers@lists.postgresql.org
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On Fri, Jun 26, 2026 at 10:50=E2=80=AFPM Alexander Korotkov
<aekorotkov@gmail.com> wrote:
> On Fri, Jun 26, 2026 at 6:20=E2=80=AFPM Dmitry Koval <d.koval@postgrespro=
.ru> wrote:
> > If we exclude case with DEFAULT partition, MERGE PARTITIONS command was
> > intended to be used when an incorrect table partitioning was chosen.
> > For example, a table was initially partitioned by month, but later we
> > needed to change table partitioning by quarter. In this case, MERGE
> > PARTITIONS command should merge several adjacent partitions into one.
> > Current checks are made for this case.
> >
> >  >- If there's *no* default partition, then I think the check should be
> >  >relaxed; it's sufficient to verify that the bounds of the merged
> >  >partition do not overlap with any partition which is not being merged=
;
> >
> > It's probably possible to do this. But in this case, the command will
> > not exactly be "MERGE PARTITIONS" ("MERGE PARTITIONS & EXPAND"?).
>
> +1,
> We can implement a support for this for 20.  For 19, I propose to
> state the restriction more explicit in the docs.  See the attached
> patch.

I'm going to push the docs patch if no objections.

------
Regards,
Alexander Korotkov
Supabase