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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alexander Korotkov <aekorotkov@gmail.com>
Cc: Andrei Lepikhov <a.lepikhov@postgrespro.ru>
Cc: Richard Guo <guofenglinux@gmail.com>
Cc: Vik Fearing <vik@postgresfriends.org>
Cc: zuming.jiang@inf.ethz.ch, pgsql-bugs@lists.postgresql.org, Alexander Korotkov <akorotkov@postgresql.org>
Subject: Re: BUG #18170: Unexpected error: no relation entry for relid 3
Date: Sun, 29 Oct 2023 11:56:56 -0400
Message-ID: <2141583.1698595016@sss.pgh.pa.us> (raw)
In-Reply-To: <CAPpHfdv_6K_sv5sL_=9EiP7Lve81WLSdiLrc22afpmg_whyxtg@mail.gmail.com>
References: <18170-f1d17bf9a0d58b24@postgresql.org>
	<4ecab120-6be3-4cf6-a2a0-249c73ae91d4@postgresfriends.org>
	<1189851.1698340331@sss.pgh.pa.us>
	<011bcae5-7840-42c7-a50c-b406189e2e78@postgrespro.ru>
	<CAPpHfdsiN0norSHfw3Ujemf=RuPzMxt5PRDiyv0vqUdwSBDtoA@mail.gmail.com>
	<721542ce-79df-469e-93e9-811fadb5bd0c@postgrespro.ru>
	<2eb87c2e-7e6f-4002-8df3-8fac3aa6a037@postgrespro.ru>
	<CAMbWs494m3AjhHry_HFCFi_SJ+6-PaeMRbx7jK39ZHmK0MVOUA@mail.gmail.com>
	<c0a5b39d-8a80-47fb-bd34-6d769f88df8f@postgrespro.ru>
	<CAPpHfduPMdLm42uwuXqM1weUKSYp=2Kf-_XU2TjZsizeZ3qoWQ@mail.gmail.com>
	<CAPpHfdv_6K_sv5sL_=9EiP7Lve81WLSdiLrc22afpmg_whyxtg@mail.gmail.com>

Alexander Korotkov <aekorotkov@gmail.com> writes:
> I made some beautification of the patch by Andrei.  I also removed the
> part which changes the target list for estimate_num_groups().  Any
> objections to pushing this?

It seems moderately likely that this will break as much as it fixes.

I've not studied the original patch enough to understand why you need
to be playing strange games with tree mutation rules, but I suspect
that this is band-aiding over some rather fundamentally bad code.

			regards, tom lane





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