Re: NOT IN subquery optimization - Mailing list pgsql-hackers

From Richard Guo
Subject Re: NOT IN subquery optimization
Date
Msg-id CAN_9JTyrC4Gr9EU-8kif74jcGazE3qhu4nciwpTC_F_=i7fVUA@mail.gmail.com
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In response to Re: NOT IN subquery optimization  (David Rowley <david.rowley@2ndquadrant.com>)
List pgsql-hackers

On Wed, Feb 27, 2019 at 4:52 AM David Rowley <david.rowley@2ndquadrant.com> wrote:
On Wed, 27 Feb 2019 at 03:07, Jim Finnerty <jfinnert@amazon.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 

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