Re: ALTER TABLE .. DETACH PARTITION CONCURRENTLY

On 2021-Mar-21, Justin Pryzby wrote:

> On Sun, Mar 21, 2021 at 03:01:15PM -0300, Alvaro Herrera wrote:
> > > But note that it doesn't check if an existing constraint "implies" the new
> > > constraint - maybe it should.
> >
> > Hm, I'm not sure I want to do that, because that means that if I later
> > have to attach the partition again with the same partition bounds, then
> > I might have to incur a scan to recheck the constraint. I think we want
> > to make the new constraint be as tight as possible ...
>
> The ATTACH PARTITION checks if any existing constraint impilies the (proposed)
> partition bounds, not just if constraints are equal. So I'm suggesting to do
> the same here.

So if we do that on DETACH, what would happen on ATTACH?

--
Álvaro Herrera 39°49'30"S 73°17'W