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https://issues.apache.org/jira/browse/CALCITE-1635?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde resolved CALCITE-1635.
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Resolution: Fixed
Fix Version/s: 1.12.0
Fixed in http://git-wip-us.apache.org/repos/asf/calcite/commit/3b78d1d7.
> Add MinRowCount metadata
> ------------------------
>
> Key: CALCITE-1635
> URL: https://issues.apache.org/jira/browse/CALCITE-1635
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Fix For: 1.12.0
>
>
> Add {{MinRowCount}} metadata, that describes that a {{RelNode}} will never
> return fewer than N rows.
> The {{GROUP BY ()}} operation has a peculiar effect if its input is empty: it
> increases the number of rows to 1. So, it is useful to know that a
> {{RelNode}} can never be empty, and a {{MinRowCount}} of 1 or higher
> communicates that.
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