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https://issues.apache.org/jira/browse/CALCITE-6680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17896487#comment-17896487
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Mihai Budiu commented on CALCITE-6680:
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Do you happen to have a test case that reproduces the issue?
> RexImpTable erroneously declares NullPolicy.NONE for IS_EMPTY
> -------------------------------------------------------------
>
> Key: CALCITE-6680
> URL: https://issues.apache.org/jira/browse/CALCITE-6680
> Project: Calcite
> Issue Type: Bug
> Components: core
> Reporter: Chris Dennis
> Priority: Major
> Attachments: is-empty-nullable.patch
>
>
> RexImpTable implements {{IS EMPTY}} and {{IS NOT EMPTY}} using
> {{Collections.isEmpty()}} but declares them as {{NullPolicy.NONE}}. This
> causes nullable array and map columns to throw NPE at execution time when
> hitting null values. I strongly suspect that other collection operators are
> similarly misclassified and would run in to issues is used against nullable
> types.
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