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From: Nathan Bossart <[email protected]>
To: Michael Paquier <[email protected]>
Cc: shihao zhong <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Subject: Re: Fixes inconsistent behavior in vacuum when it processes multiple relations
Date: Fri, 20 Jun 2025 14:16:46 -0500
Message-ID: <aFWznvZtYZ3VJxgi@nathan> (raw)
In-Reply-To: <[email protected]>
References: <CAGRkXqTo+aK=GTy5pSc-9cy8H2F2TJvcrZ-zXEiNJj93np1UUw@mail.gmail.com>
	<aFLp9sMEHFHULOFx@nathan>
	<CAGRkXqTp9k_7X1OqqQSnVfoyGxAM3SQ083CcyaezBg9qQ8i+qg@mail.gmail.com>
	<aFRzYhOTZcRgKPLu@nathan>
	<[email protected]>

On Fri, Jun 20, 2025 at 10:34:19AM +0900, Michael Paquier wrote:
> Hmm.  I like the simplicity of option 2) for the purpose the back
> branches and the post-feature-freeze v18.

Yeah, let's do this for now.

> However, Option 1) would be my go-to option for HEAD (as of v19
> opening for business), but I think that we should harden the code more
> than suggested and treat all VacuumParams as purely input arguments
> rather keeping some pointers to it depending on the code path we are
> dealing with, so as no callers of these inner routines is surprised by
> changes that may happen internally.  Hence, reading the code of v2,
> I'd suggest to apply the same rule to vacuum_get_cutoffs(),
> do_analyze_rel() and heap_vacuum_rel().  Except if I am missing
> something, it looks like all these calls should be OK with this new
> policy.  This implies also changing relation_vacuum() in tableam.h,
> which can be a HEAD-only change anyway.

Sounds reasonable to me.

-- 
nathan





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