On Mon, Mar 4, 2019 at 2:04 PM Bruce Momjian <bruce@momjian.us> wrote:
> On Mon, Mar 4, 2019 at 12:44:41PM -0500, Robert Haas wrote:
> > I think that's a separate but also promising thing to attack, and I
> > agree that it'd take a lot of work to get there. I don't think that
> > the problem with either parse-tree-copying or list usage is that no
> > performance benefits are to be had; I think it's that the amount of
> > work required to get those benefits is pretty large. If it were
> > otherwise, somebody likely would have done it before now.
>
> Stupid question, but do we use any kind of reference counter to know if
> two subsystems look at a structure, and a copy is required?
No, but I wonder if we could use Valgrind to enforce rules about who
has the right to scribble on what, when. That could make it a lot
easier to impose a new rule.
--
Peter Geoghegan