Re: Expanding DELETE/UPDATE returning

On Mon, Feb 26, 2007 at 11:14:01PM -0500, Tom Lane wrote:
> Rusty Conover <rconover(at)infogears(dot)com> writes:
> > I didn't see this on the TODO list, but if it is my apologies. Is it
> > in the cards to expand the functionality of DELETE/UPDATE returning
> > to be able to sort the output of the rows returned?
>
> No.
>
> > Or allow delete
> > and update to be used in sub-queries?
>
> That's been discussed but the implementation effort seems far from
> trivial. One big problem is that a sub-query can normally be
> re-executed multiple times, eg on the inner side of a join; whereas
> that's clearly not acceptable for an insert/update/delete.

Couldn't we avoid that by writing the data to a tuplestore? Or is it too
hard to detect the cases when that would need to happen?
--
Jim Nasby jim(at)nasby(dot)net
EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)