Stephan Szabo <sszabo@megazone23.bigpanda.com> writes:
> ... let you do the replace and keep reading (at the penalty that
> you've now got to have a way to know when to remove the
> various <something>s)
That is the hard part. Mike's description omitted one crucial step:
6. The old "foo" goes away when the last open file handle for it is
closed.
I doubt there is any practical way for Postgres to cause that to happen
if the OS itself does not have any support for it.
regards, tom lane