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https://issues.apache.org/jira/browse/CALCITE-1861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16075958#comment-16075958
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David Smiley commented on CALCITE-1861:
---------------------------------------

Yes; my mention of LocationTech's SF Curve library should have indicated it 
includes Uzaygezen: 
https://github.com/locationtech/sfcurve/blob/master/hilbert/src/main/scala/org/locationtech/sfcurve/hilbert/HilbertCurve2D.scala

> Spatial Indexes
> ---------------
>
>                 Key: CALCITE-1861
>                 URL: https://issues.apache.org/jira/browse/CALCITE-1861
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Atri Sharma
>            Assignee: Julian Hyde
>
> 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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