| From: | Sergey Prokhorenko <sergeyprokhorenko(at)yahoo(dot)com(dot)au> |
|---|---|
| To: | Jelte Fennema-Nio <postgres(at)jeltef(dot)nl>, "Andrey M(dot) Borodin" <x4mmm(at)yandex-team(dot)ru> |
| Cc: | pgsql-hackers mailing list <pgsql-hackers(at)postgresql(dot)org>, Aleksander Alekseev <aleksander(at)timescale(dot)com>, Przemysław Sztoch <przemyslaw(at)sztoch(dot)pl>, Nikolay Samokhvalov <nik(at)postgres(dot)ai>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, 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>, "brad(at)peabody(dot)io" <brad(at)peabody(dot)io>, Kirk Wolak <wolakk(at)gmail(dot)com> |
| Subject: | Re: UUID v7 |
| Date: | 2024-01-30 07:28:28 |
| Message-ID: | 1971811009.2132347.1706599708209@mail.yahoo.com |
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| Lists: | pgsql-hackers |
Andrey,
I think this phrase is outdated: "This function can optionally accept a timestamp used instead of current time.This allows implementation of k-way sotable identifiers."
This phrase is wrong: "Both functions return a version 4 (random) UUID."
For this phrase the reason is unclear and the phrase is most likely incorrect:
if large batches of UUIDs are generated at the+ same time it's possible that some UUIDs will store a time that is slightly later+ than their actual generation time
Sergey Prokhorenko
sergeyprokhorenko(at)yahoo(dot)com(dot)au
On Tuesday, 30 January 2024 at 09:55:04 am GMT+3, Andrey M. Borodin <x4mmm(at)yandex-team(dot)ru> wrote:
> On 30 Jan 2024, at 01:38, Jelte Fennema-Nio <postgres(at)jeltef(dot)nl> wrote:
>
> Yeah, I liked the feature to generate UUIDv7 based on timestamp too.
> But following the spec seems more important than a nice feature to me.
PFA v15. Changes: removed timestamp argument, incorporated Jelte’s documentation addons.
Thanks!
Best regards, Andrey Borodin.
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