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https://issues.apache.org/jira/browse/CALCITE-1861?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17039408#comment-17039408
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Michael Mior commented on CALCITE-1861:
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[~txy2539] Right now, this is a predicate that is explicitly mentioned in the
query. That is, the rule matches a condition on the query that looks like
`hilbertColumn = hilbert(latitude, longitude)`. For testing, you can start with
just creating a table populated with the appropriate values. That is, you would
have the columns `latitude`, `longitude`, and `hilbertColumn` where the last
column contains the pre-computed position on the Hilbert curve.
> 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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