Re: 回复：[Internet]Re: [PATCH] Prevent replacement of a function if it's used in an index expression and is not IMMUTABLE

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
Cc: sundayjiang(蒋浩天) <sundayjiang(at)tencent(dot)com>, jian he <jian(dot)universality(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: 回复：[Internet]Re: [PATCH] Prevent replacement of a function if it's used in an index expression and is not IMMUTABLE
Date: 2025-07-09 19:11:24
Message-ID: 1338896.1752088284@sss.pgh.pa.us
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"David G. Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> writes:
> On Wed, Jul 9, 2025 at 9:15 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> TBH, I find this proposal to be useless nannyism.

> Isn't preventing a dump-restore hazard sufficient reason to do this?

No, I don't think so. If you're not being very careful about revising
functions used in indexes, you are going to have problems a lot sooner
than some future dump/restore cycle.

regards, tom lane

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