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From: Matthias van de Meent <[email protected]>
To: Dmitry Koval <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: Add SPLIT PARTITION/MERGE PARTITIONS commands
Date: Tue, 31 May 2022 12:30:22 +0200
Message-ID: <CAEze2WhU9Wkn2gD9FC6kbuh1gUdqCmdi9_d62-NeBkPZ_5=eOA@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
	<[email protected]>

On Tue, 31 May 2022 at 11:33, Dmitry Koval <[email protected]> wrote:
>
> Hi, hackers!
>
> There are not many commands in PostgreSQL for working with partitioned
> tables. This is an obstacle to their widespread use.
> Adding SPLIT PARTITION/MERGE PARTITIONS operations can make easier to
> use partitioned tables in PostgreSQL.

That is quite a nice and useful feature to have.

> (This is especially important when migrating projects from ORACLE DBMS.)
>
> SPLIT PARTITION/MERGE PARTITIONS commands are supported for range
> partitioning (BY RANGE) and for list partitioning (BY LIST).
> For hash partitioning (BY HASH) these operations are not supported.

Just out of curiosity, why is SPLIT / MERGE support not included for
HASH partitions? Because sibling partitions can have a different
modulus, you should be able to e.g. split a partition with (modulus,
remainder) of (3, 1) into two partitions with (mod, rem) of (6, 1) and
(6, 4) respectively, with the reverse being true for merge operations,
right?


Kind regards,

Matthias van de Meent

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