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https://issues.apache.org/jira/browse/CALCITE-1861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17038707#comment-17038707
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Tao Yang commented on CALCITE-1861:
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[~julianhyde] Hi Julian, I found that the Hilbert curve function and the
function that transfers region to index on Hilbert curve index have been
implemented by using 'com.google.uzaygezen.core.CompactHilbertCurve' and
related packages.
Spatial Rules that optimize the ST_Within is also implemented.
But in LogicalProject, there is a HILBERT=[$4], meaning we need to select from
a column that has the index on the curve. Is this HILBERT column maintained in
the memory or in the database? How does Apache Calcite generate and maintain
this column( might be a B+tree)?
> 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
>
> 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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