Bruce Momjian <bruce@momjian.us> writes:
> If we only prune on an update (or insert) why not just do prune every
> time?
The problem is you can't prune anymore once you have existing pin on the
target page. I'd really like to get around that, but so far it seems
unacceptably fragile --- the executor really doesn't expect tuples to
get moved around underneath it.
regards, tom lane