Re: NOT IN subquery optimization

On Wed, Feb 27, 2019 at 4:52 AM David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>
wrote:

> On Wed, 27 Feb 2019 at 03:07, Jim Finnerty <jfinnert(at)amazon(dot)com> wrote:
>
> If you're proposing to do that for this thread then I can take my
> planner only patch somewhere else. I only posted my patch as I pretty
> much already had what I thought you were originally talking about.
> However, please be aware there are current patents around adding
> execution time smarts in this area, so it's probably unlikely you'll
> find a way to do this in the executor that does not infringe on those.
> Probably no committer would want to touch it. I think my patch covers
> a good number of use cases and as far as I understand, does not go
> near any current patents.
>
> Thanks for pointing out the patent concerns. I was not aware of that
before.
Could you please provide some clue where I can find more info about the
patents?

Thanks
Richard