Horton

Re: Add SPLIT PARTITION/MERGE PARTITIONS commands

jian he <jian.universality@gmail.com>

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From: jian he <jian.universality@gmail.com>
To: Alexander Korotkov <aekorotkov@gmail.com>
Cc: Kirill Reshke <reshkekirill@gmail.com>, zengman <zengman@halodbtech.com>, pgsql-hackers <pgsql-hackers@lists.postgresql.org>
Date: 2025-12-20T11:14:53Z
Lists: pgsql-hackers

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On Sat, Dec 20, 2025 at 6:42 PM Alexander Korotkov <aekorotkov@gmail.com> wrote:
>
> Hi Kirill!

> > reshke=# alter table only z merge partitions (z_1,z_2) into z_12;
> > ALTER TABLE
> > reshke=#
> >
> > ```
> >
> > IMO "alter table only ... merge partitions" does not make perfect
> > sense and should be rejected rather than executed. WDYT?
>
> Could you, please, clarify your point? I didn't quite get it.  It
> looks like pretty basic example of merging two adjacent partitions.
>

> reshke=# alter table only z merge partitions (z_1,z_2) into z_12;
I think it should fail, because we are not applying to table "z" itself,
For Split/Merge partitions, we are processing the whole partitioned
table z hierarchy.

alter table z merge partitions (z_1,z_2) into z_12;
should work.

I guess the attached maybe is what Krill wants.

--
jian
https://www.enterprisedb.com