Re: Incorrect calculation of path fraction value in MergeAppend

Tom Lane <tgl@sss.pgh.pa.us>

From: Tom Lane <tgl@sss.pgh.pa.us>

To: Alvaro Herrera <alvherre@alvh.no-ip.org>

Cc: Alexander Korotkov <aekorotkov@gmail.com>, Junwang Zhao <zhjwpku@gmail.com>, Andrei Lepikhov <lepihov@gmail.com>, "pgsql-bugs@lists.postgresql.org" <pgsql-bugs@lists.postgresql.org>, Tomas Vondra <tomas@vondra.me>

Date: 2025-05-18T14:28:58Z

Lists: pgsql-bugs

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

Fix tuple_fraction calculation in generate_orderedappend_paths()
- 3d3a81fc24b0 18.0 landed
Consider fractional paths in generate_orderedappend_paths
- 6b94e7a6da2f 15.0 cited

Alvaro Herrera <alvherre@alvh.no-ip.org> writes:
> Personally I can see getting this in 18beta2 without too much additional
> arguing for it.  But for 15-17 you'd need a lot more support than is
> evident in this thread.

+1.  The bar for causing plan changes in back branches is very high.
Unless you can show that the buggy behavior is causing wrong answers,
it's usually best to leave it alone.

			regards, tom lane