On Mon, Mar 4, 2019 at 2:04 PM Bruce Momjian <br...@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
