Re: UUID v7

Hi Andrey,

On Tue, Jan 30, 2024 at 5:56 PM Andrey M. Borodin <x4mmm@yandex-team.ru> wrote:
>
>
>
> > On 30 Jan 2024, at 12:28, Sergey Prokhorenko <sergeyprokhorenko@yahoo.com.au> wrote:
> >
> >
> > I think this phrase is outdated: "This function can optionally accept a timestamp used instead of current time.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.”
> Fixed.
>
> > This phrase is wrong: "Both functions return a version 4 (random) UUID.”
> This applies to functions gen_random_uuid() and uuidv4().
> >
> > 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
>
> I’ve rewritten this phrase, hope it’s more clear now.
>
>
> Best regards, Andrey Borodin.

+Datum
+uuid_extract_var(PG_FUNCTION_ARGS)
+{
+ pg_uuid_t  *uuid = PG_GETARG_UUID_P(0);
+ uint16_t result;
+ result = uuid->data[8] >> 6;
+
+ PG_RETURN_UINT16(result);
+}
\ No newline at end of file

It's always good to add a newline at the end of a  source file, though
this might be nitpicky.

--
Regards
Junwang Zhao