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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:
-----------------------------------

[~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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