Re: Avoid orphaned objects dependencies, take 3

On Thu, Jun 13, 2024 at 12:52 PM Bertrand Drouvot
 wrote:
> > > table_open(childRelId, ...) would lock any "ALTER TABLE  DROP CONSTRAINT"
> > > already. Not sure I understand your concern here.
> >
> > I believe this is not true. This would take a lock on the table, not
> > the constraint itself.
>
> I agree that it would not lock the constraint itself. What I meant to say is that
> , nevertheless, the constraint can not be dropped. Indeed, the "ALTER TABLE"
> necessary to drop the constraint (ALTER TABLE  DROP CONSTRAINT) would
> be locked by the table_open(childRelId, ...).

Ah, right. So, I was assuming that, with either this version of your
patch or the earlier version, we'd end up locking the constraint
itself. Was I wrong about that?

-- 
Robert Haas
EDB: http://www.enterprisedb.com