Julian Hyde commented on CALCITE-1861:

[~mmior], I got a lot of it working in my branch 
https://github.com/julianhyde/calcite/commits/1861-spatial. I don't recall why 
I didn't mark it 'complete' and merge to master. Let me rebase that branch onto 
latest master.

I recall that I got certain cases working (e.g. a column based on space-filling 
curve, that allows points-near-a-constant-point and points-in-a-constant-region 
queries to work), and others I did not complete (e.g. a table that contains 
tiles, to allow regions-that-overlap-regions queries to work).

Please ask your student to post comments to this case; we can collaborate here.

> Spatial Indexes
> ---------------
>                 Key: CALCITE-1861
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1861
>             Project: Calcite
>          Issue Type: Improvement
>          Components: spatial
>            Reporter: Atri Sharma
>            Priority: Major
>              Labels: gsoc2018
> Many Calcite users, like Phoenix and Flink can benefit from support of 
> Spatial indexes.
> See:
> http://revenant.ca/www/postgis/workshop/indexing.html

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