On Mon, Oct 6, 2014 at 8:35 AM, Robert Haas <robertmhaas@gmail.com> wrote:
> I think the problem is that it's not possible to respect the "usual
> guarantees" even at READ COMMITTED level when performing an INSERT OR
> UPDATE operation (however spelled).
That's definitely the main problem. Also, there could be garden
variety race conditions.
--
Peter Geoghegan