On Aug 27, 2012, at 8:56 PM, Tom Lane wrote:
> This formula is not actually correct, as you'd soon find out if you
> experimented with values with the high-order bit of the low-order word
> set. (Hint: sign extension.)
>
> The correct formula is both simpler and far more efficient:
>
> (classid::int8 << 32) | objid::int8
>
> This works because oidtoi8 correctly treats the OID value as unsigned.
Oh, nice, thanks!
David