Support for XLogRecPtr in expand_fmt_string?

Hi,

I wonder if we just should add a format code like %R or something similar as a 
replacement for the %X/%X notion. Having to type something like "(uint32)
(state->curptr >> 32), (uint32)state->curptr" everywhere is somewhat annoying.

Opinions?

Andres
-- 
Andres Freund        http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services