Re: Question Regarding Merge Append and Parallel Execution of Index Scans on Partitioned Table

From: David Rowley <dgrowleyml(at)gmail(dot)com>
To: Ayush Vatsa <ayushvatsa1810(at)gmail(dot)com>
Cc: PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Question Regarding Merge Append and Parallel Execution of Index Scans on Partitioned Table
Date: 2025-06-05 21:23:03
Message-ID: CAApHDvpdk5tBVp35x++d0ztEBMD0XUnYAydLd7q6K2yecRN_tw@mail.gmail.com
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On Fri, 6 Jun 2025 at 07:49, Ayush Vatsa <ayushvatsa1810(at)gmail(dot)com> wrote:
> That said, I’m wondering if this might not be necessary, given that
> Gather Merge already accomplishes similar functionality. Would
> love to hear your thoughts on whether there’s a distinct advantage to
> adding parallelism to Merge Append or if Gather Merge sufficiently
> covers all the use cases.

Gather Merge supports only a single subnode. Merge Append supports any number.

David

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