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https://issues.apache.org/jira/browse/CALCITE-2569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17165173#comment-17165173
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Rui Wang commented on CALCITE-2569:
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[~julianhyde]
I will take a look tomorrow.
> UDFs that are table functions must implement SqlTableFunction and have CURSOR
> as their return type
> --------------------------------------------------------------------------------------------------
>
> Key: CALCITE-2569
> URL: https://issues.apache.org/jira/browse/CALCITE-2569
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Assignee: Julian Hyde
> Priority: Major
>
> UDFs that are table functions must implement SqlTableFunction and have CURSOR
> as their return type,
> Validate that table functions are not used in contexts that require scalar
> functions, such as the SELECT clause.
> Change operand type ANY to mean 'scalar expression of any type (but not a
> cursor)', and add operand type IGNORE to mean skip validation - for an
> operand that is not an expression. TABLE is one of the few operators that
> accepts a CURSOR operand.
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