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help / color / mirror / Atom feedFrom: Alexander Korotkov <[email protected]>
To: jian he <[email protected]>
Cc: Kirill Reshke <[email protected]>
Cc: zengman <[email protected]>
Cc: pgsql-hackers <[email protected]>
Subject: Re: Add SPLIT PARTITION/MERGE PARTITIONS commands
Date: Sat, 20 Dec 2025 13:26:59 +0200
Message-ID: <CAPpHfduDafmBYttv6ZMacq6qpjcyOjrUOC=7DVb4_nURiWLRzQ@mail.gmail.com> (raw)
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On Sat, Dec 20, 2025 at 1:15 PM jian he <[email protected]> wrote:
> On Sat, Dec 20, 2025 at 6:42 PM Alexander Korotkov <[email protected]> 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.
Thank you. I missed there is an ONLY keyword. But I'm not sure about
the error message. I don't think the problem with ONLY keyword is
that MERGE/SPLIT must be always recursive. I think opposite, it's
always non-recursive and this is why ONLY is meaningless. Otherwise,
we may decide to just leave it as it allowing ONLY.
------
Regards,
Alexander Korotkov
Supabase
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To: [email protected]
Cc: [email protected], [email protected], [email protected], [email protected], [email protected]
Subject: Re: Add SPLIT PARTITION/MERGE PARTITIONS commands
In-Reply-To: <CAPpHfduDafmBYttv6ZMacq6qpjcyOjrUOC=7DVb4_nURiWLRzQ@mail.gmail.com>
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