Re: MergeAppend could consider sorting cheapest child path

Richard Guo <guofenglinux@gmail.com>

From: Richard Guo <guofenglinux@gmail.com>

To: Alexander Korotkov <aekorotkov@gmail.com>

Cc: Andrei Lepikhov <lepihov@gmail.com>, Alexander Pyhalov <a.pyhalov@postgrespro.ru>, Andy Fan <zhihuifan1213@163.com>, Bruce Momjian <bruce@momjian.us>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>, Nikita Malakhov <HukuToc@gmail.com>

Date: 2025-09-08T08:39:40Z

Lists: pgsql-hackers

Commits

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Mostly-cosmetic adjustments to estimate_multivariate_bucketsize().
- aadf7db66ef5 19 (unreleased) cited
Consider fractional paths in generate_orderedappend_paths
- 6b94e7a6da2f 15.0 cited

On Sun, Sep 7, 2025 at 8:26 PM Alexander Korotkov <aekorotkov@gmail.com> wrote:
> Great, thank you for catching this.  The diff of costs is attached.  I
> see the costs now are better or within the fuzz factor.

Will have a review by the end of this commitfest.

- Richard