| From: | Petr Jelinek <petr(at)2ndquadrant(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Steve Singer <steve(at)ssinger(dot)info>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Andres Freund <andres(at)2ndquadrant(dot)com>, Jim Nasby <Jim(dot)Nasby(at)bluetreble(dot)com>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Anssi Kääriäinen <anssi(dot)kaariainen(at)thl(dot)fi>, Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Jaime Casanova <jaime(at)2ndquadrant(dot)com> |
| Subject: | Re: tracking commit timestamps |
| Date: | 2014-11-25 15:33:15 |
| Message-ID: | 5474A13B.9050007@2ndquadrant.com |
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| Lists: | pgsql-hackers pgsql-www |
On 25/11/14 16:30, Alvaro Herrera wrote:
> Petr Jelinek wrote:
>> On 25/11/14 16:23, Alvaro Herrera wrote:
>>> Robert Haas wrote:
>
>>>> Maybe 0 should get translated to a NULL return, instead of a bogus timestamp.
>>>
>>> That's one idea --- surely no transaction is going to commit at 00:00:00
>>> on 2000-01-01 anymore. Yet this is somewhat discomforting.
>>
>> I solved it for xids that are out of range by returning -infinity and then
>> changing that to NULL in sql interface, but no idea how to do that for
>> aborted transactions.
>
> I guess the idea is that we just read the value from the slru and if it
> exactly matches allballs we do the same -infinity return and translation
> to NULL. (Do we really love this -infinity idea? If it's just an
> internal API we can use a boolean instead.)
>
As in returning boolean instead of void as "found"? That works for me
(for the C interface).
--
Petr Jelinek http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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