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https://issues.apache.org/jira/browse/CALCITE-1861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17180767#comment-17180767
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Julian Hyde commented on CALCITE-1861:
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There's now a PR. I'd appreciate review.
> Spatial index, based on Hilbert space-filling curve
> ---------------------------------------------------
>
> Key: CALCITE-1861
> URL: https://issues.apache.org/jira/browse/CALCITE-1861
> Project: Calcite
> Issue Type: Improvement
> Components: spatial
> Reporter: Atri Sharma
> Assignee: Julian Hyde
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.26.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> 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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