Re: including backend ID in relpath of temp rels - updated patch

One other thought about all this: in the past, one objection that's been
raised to deleting files during crash restart is the possible loss of
forensic evidence.  It might be a good idea to provide some fairly
simple way for developers to disable that deletion subroutine.  I'm not
sure that it rises to the level of needing a GUC, though.

			regards, tom lane