| From: | Andres Freund <andres(at)anarazel(dot)de> |
|---|---|
| To: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
| Cc: | Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Peter Geoghegan <pg(at)bowt(dot)ie>, Robert Haas <robertmhaas(at)gmail(dot)com>, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, Greg Stark <stark(at)mit(dot)edu>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: 64-bit queryId? |
| Date: | 2017-10-03 08:12:11 |
| Message-ID: | 20171003081211.s2cvtmpitmadagya@alap3.anarazel.de |
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| Lists: | pgsql-hackers |
On 2017-10-03 17:06:20 +0900, Michael Paquier wrote:
> On Tue, Oct 3, 2017 at 3:12 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
> > On 2017-10-03 03:07:09 +0300, Alexander Korotkov wrote:
> >> On Tue, Oct 3, 2017 at 12:32 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> >> +1,
> >> I see 3 options there:
> >> 1) Drop high-order bit, as you proposed.
> >> 2) Allow negative queryIds.
> >> 3) Implement unsigned 64-type.
> >
> > 4) use numeric, efficiency when querying is not a significant concern here
> > 5) use a custom type that doesn't support arithmetic, similar to pg_lsn.
>
> Why not just returning a hexa-like text?
Two reasons: First, it'd look fairly different to before, whereas 4/5
would probably just continue to work fairly transparently in a lot of
cases. Secondly, what's the advantage in doing so over 4)?
Greetings,
Andres Freund
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