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https://issues.apache.org/jira/browse/CALCITE-4186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17611993#comment-17611993
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Julian Hyde commented on CALCITE-4186:
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[~bchapuis], Is this issue now fixed?
> Add ST_Covers, ST_CoveredBy, ST_Relate spatial functions
> --------------------------------------------------------
>
> Key: CALCITE-4186
> URL: https://issues.apache.org/jira/browse/CALCITE-4186
> Project: Calcite
> Issue Type: Bug
> Components: spatial
> Reporter: Julian Hyde
> Priority: Major
>
> Add {{ST_Covers}}, {{ST_CoveredBy}}, {{ST_Relate}} spatial functions.
> There are [subtle differences between ST_Contains and
> ST_Covers|http://lin-ear-th-inking.blogspot.com/2007/06/subtleties-of-ogc-covers-spatial.html];
> {{ST_Covers}} is usually what you want, and is easier to compute.
> Extend the Hilbert spatial index (added in CALCITE-1861) to handle
> {{ST_Covers}}, {{ST_CoveredBy}}, {{ST_ContainsPropertly}} as it does
> {{ST_DWithin}} and {{ST_Contains}}.
> It might make sense to also implement {{ST_ExteriorRing}} so that we can
> implement the [PostGIS example|https://postgis.net/docs/ST_Covers.html].
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