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https://issues.apache.org/jira/browse/CALCITE-1861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16073196#comment-16073196
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Julian Hyde commented on CALCITE-1861:
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Another possible library: Google's
[uzaygezen|https://github.com/aioaneid/uzaygezen project] maps between
multi-dimensional points and Hilbert curves and is Apache licensed.
> 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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