Re: [HACKERS] Merge join for GiST

On Tue, Apr 11, 2017 at 2:17 AM, Alexander Korotkov
<a.korotkov@postgrespro.ru> wrote:
> FYI, I've implemented this algorithm for pgsphere.  See following branch.
> https://github.com/akorotkov/pgsphere/tree/experimental
> It's implemented as crossmatch() function which takes as arguments names of
> two indexes over spoint and maximum distance (it checks not overlapping but
> proximity of points).  This function returns setof pairs of TIDs.
>
> Later, Dmitry Ivanov made it a custom scan node.
> https://github.com/akorotkov/pgsphere/tree/crossmatch_cnode
>
> You also can find some experimental evaluation here:
> http://www.adass2016.inaf.it/images/presentations/10_Korotkov.pdf

Do you have a sense of how this might compare with range merge join?

Regards,    Jeff Davis