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From: Tom Lane <[email protected]>
To: Álvaro Herrera <[email protected]>
Cc: Shinya Kato <[email protected]>
Cc: pgsql-hackers <[email protected]>
Subject: Re: Use pg_current_xact_id() instead of deprecated txid_current()
Date: Sun, 08 Feb 2026 11:24:44 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <CAOzEurQetW=-1+OnMo8baeVQF=-kAr-wNtFcgRNo+ErPk=xsDQ@mail.gmail.com>
	<[email protected]>

=?UTF-8?Q?=C3=81lvaro_Herrera?= <[email protected]> writes:
> On 2026-02-08, Shinya Kato wrote:
>> Since pg_current_xact_id() returns xid8 which does not support
>> arithmetic operators, places that need "xid + 1" cast the result via
>> ::text::bigint first.

> I think it may be better to add some operators, or was there a rationale for these not being there?

I'm fairly concerned about overloading the arithmetic operators with
unsigned versions.  The reason we never invented SQL-level uint8 and
such is fear of getting a lot of "ambiguous operator" errors.  Now,
if we are careful not to create implicit casts between xid[8] and
any ordinary type, maybe it'd be okay to invent xid+int, xid8-int,
and a few more.

As things stand, I don't find the proposed patch to be an improvement.

			regards, tom lane

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