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https://issues.apache.org/jira/browse/CALCITE-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17602548#comment-17602548
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Julian Hyde commented on CALCITE-5281:
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By the way, {{Collect}} is even stranger, and I'm not sure it even needs to
exist. For that pattern, converting sets of rows into scalar values (e.g.
integers, strings, arrays) then aggregate functions are definitely the way to
go.
> Implement geometry set returning functions (SRF)
> ------------------------------------------------
>
> Key: CALCITE-5281
> URL: https://issues.apache.org/jira/browse/CALCITE-5281
> Project: Calcite
> Issue Type: Improvement
> Components: spatial
> Reporter: Bertil Chapuis
> Assignee: Bertil Chapuis
> Priority: Minor
>
> The idea is to implement set returning functions, such as ST_Explode in H2GIS
> and ST_Dump in PostGIS. Is the Uncollect class a good starting point?
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