Re: Reduce "Var IS [NOT] NULL" quals during constant folding

On Sun, Mar 23, 2025 at 6:25 PM Richard Guo <guofenglinux(at)gmail(dot)com> wrote:
> On Sat, Mar 22, 2025 at 2:21 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> > The way to make this work is what I said before: move the planner's
> > collection of relation information to somewhere a bit earlier in
> > the planner. But not to outside the planner.

> I'm considering moving the collection of attnotnull information before
> pull_up_sublinks, in hopes of leveraging this info to pull up NOT IN
> in the future, something like attached.

Here is an updated version of the patch with some cosmetic changes and
a more readable commit message. I'm wondering if it's good enough to
be pushed. Any comments?

Thanks
Richard