Re: Add SPLIT PARTITION/MERGE PARTITIONS commands

On Fri, Jun 26, 2026 at 6:20 PM Dmitry Koval <d(dot)koval(at)postgrespro(dot)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.

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Regards,
Alexander Korotkov
Supabase