Re: pg_lsn cast to/from int8

On Tue, Jan 26, 2016 at 4:58 PM, Craig Ringer <craig(at)2ndquadrant(dot)com> wrote:

> On 26 January 2016 at 22:07, Magnus Hagander <magnus(at)hagander(dot)net> wrote:
>
>
>> In this case, mostly legacy compatibility. Making an app that works with
>> versions that don't have pg_lsn have a nice path forward to the modern
>> world. Being able to cast from pg_lsn to int8 can also make it easier to
>> work with the values in the client application, though I don't need that
>> for this particular one.
>>
>>
> Wouldn't we need a uint8 type for that?
>
> I guess we could just show people negative LSNs if the high bit is set
> (that being rather unlikely) but still...
>

Yes, in theory. Though the likelihood of actually reaching that... It would
probably be OK to just throw an error if the high bit is actually set.

--
Magnus Hagander
Me: http://www.hagander.net/
Work: http://www.redpill-linpro.com/