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Subject: Re: eliminate xl_heap_visible to reduce WAL (and eventually set VM
 on-access)
From: Chao Li <li.evan.chao@gmail.com>
In-Reply-To: <45662821-41F0-4232-87B7-76A3B5E36BE1@gmail.com>
Date: Mon, 24 Nov 2025 17:31:31 +0800
Cc: Kirill Reshke <reshkekirill@gmail.com>,
 Andres Freund <andres@anarazel.de>,
 Robert Haas <robertmhaas@gmail.com>,
 Andrey Borodin <x4mmm@yandex-team.ru>,
 PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>,
 Heikki Linnakangas <hlinnaka@iki.fi>
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To: Melanie Plageman <melanieplageman@gmail.com>
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> On Nov 24, 2025, at 16:07, Chao Li <li.evan.chao@gmail.com> wrote:
>=20
> 0006, 0007 look good, no comment.

I missed a nit comment in 0007:

7 - 0007
```
+ * To handle recovery conflict during logical decoding on standby, we =
must know
+ * if the table is a catalog table. Note that in visibilitymapdefs.h
+ * VISIBLITYMAP_XLOG_CATALOG_REL is also defined as (1 << 2). =
xl_heap_prune
+ * records should use XLHP_IS_CATALOG_REL, not =
VISIBILIYTMAP_XLOG_CATALOG_REL --
+ * even if they only contain updates to the VM.
```

VISIBLITYMAP_XLOG_CATALOG_REL missed =E2=80=9CI=E2=80=9D after =E2=80=9CB=E2=
=80=9D.

Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/