[postgis-devel] Lacking of exact knn-gist?

Alexander Korotkov aekorotkov at gmail.com
Fri Jun 27 10:29:58 PDT 2014


Turning back to this topic. Could you prepare dump and SQL examples,

With best regards,
Alexander Korotkov.

On Fri, Jan 17, 2014 at 6:04 PM, Paul Ramsey <pramsey at cleverelephant.ca>

> Alex,
> This piece of the workshop gives some visuals about how unpleasant
> reasoning abound nearest neighbour using boxes is. (It’s almost
> embarrassing trying to explain it to people)
> http://workshops.boundlessgeo.com/postgis-intro/knn.html
> You can pull the NYC roads data from the associated data package and
> replicate the results.
> I can prepare something more plug-n-play (dump file and SQL examples) when
> I get back home if needed.
> P.
> --
> Paul Ramsey
> http://cleverelephant.ca
> http://postgis.net
> On January 17, 2014 at 9:01:33 AM, Alexander Korotkov (
> aekorotkov at gmail.com <//aekorotkov at gmail.com>) wrote:
> You may take a look at my patch to PostgreSQL enabling exact knn-gist:
> http://www.postgresql.org/message-id/CAPpHfdu_qBLNRnv-r=_tofZYYa6-r=Z5_MGF4_phAOkWcYxfRg@mail.gmail.com
>  Ideally, it could be in 9.4. But I expect serious critics about accessing
> heap from gist is fundamentally bad design.
> Test cases are very welcome. It would be very nice to have them before January
> 19. <http://airmail.calendar/2014-01-19%2012:00:00%20EST> I know it very
> soon, but in this case I can include them to PGCon proposal.
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