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https://issues.apache.org/jira/browse/CALCITE-1861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16070540#comment-16070540
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Atri Sharma commented on CALCITE-1861:
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Spatial4j looks pretty good to me, I think we should use it

> 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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