Re: UUID v7

From: "Andrey M(dot) Borodin" <x4mmm(at)yandex-team(dot)ru>
To: Przemysław Sztoch <przemyslaw(at)sztoch(dot)pl>
Cc: Andrey Borodin <amborodin86(at)gmail(dot)com>, Jelte Fennema <postgres(at)jeltef(dot)nl>, Nick Babadzhanian <pgnickb(at)gmail(dot)com>, Mat Arye <mat(at)timescaledb(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Matthias van de Meent <boekewurm+postgres(at)gmail(dot)com>, Nikolay Samokhvalov <samokhvalov(at)gmail(dot)com>, "Kyzer Davis (kydavis)" <kydavis(at)cisco(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, "brad(at)peabody(dot)io" <brad(at)peabody(dot)io>, "wolakk(at)gmail(dot)com" <wolakk(at)gmail(dot)com>, sergeyprokhorenko(at)yahoo(dot)com(dot)au
Subject: Re: UUID v7
Date: 2024-01-04 18:20:11
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Hello Przemysław,

thanks for your interest in this patch!

> On 3 Jan 2024, at 04:37, Przemysław Sztoch <przemyslaw(at)sztoch(dot)pl> wrote:
> 1. Is it possible to add a function that returns the version of the generated uuid?
> It will be very useful.
> I don't know if it's possible, but I think there are bits in the UUID that inform about the version.
What do you think if we have functions get_uuid_v7_ver(uuid) and get_uuid_v7_var(uuid) to extract bit fields according to [0] ? Or, perhaps, this should be one function with two return parameters?
It's not in a patch yet, I'm just considering how this functionality should look like.

> 2. If there is any doubt about adding the function to the main sources (standard development in progress), in my opinion you can definitely add this function to the uuid-ossp extension.
From my POV we can just have this function in the core. OSSP support for UUID seems more or less dead [1]: "Newsflash: 04-Jul-2008: Released OSSP uuid 1.6.2". Or do I look into wrong place?

> 3. Wouldn't it be worth including UUID version 6 as well?
The standard in [0] says "Systems that do not involve legacy UUIDv1 SHOULD use UUIDv7 Section 5.7 instead." If there's a point in developing v6 - I'm OK to do so.

> 4. Sometimes you will need to generate a uuid for historical time. There should be an additional function gen_uuid_v7(timestamp).
Done, please see patch attached. But I changed signature to gen_uuid_v7(int8), to avoid messing with bytes from user who knows what they want. Or do you think gen_uuid_v7(timestamp) would be more convenient?


Best regards, Andrey Borodin.


Attachment Content-Type Size
v8-0001-Implement-UUID-v7-as-per-IETF-draft.patch application/octet-stream 9.0 KB
v8-0002-Add-optional-argument-unix_ts_ms-to-gen_uuid_v7.patch application/octet-stream 5.7 KB

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  • Re: UUID v7 at 2024-01-04 22:44:27 from Jelte Fennema-Nio

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