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https://issues.apache.org/jira/browse/CALCITE-2569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17165126#comment-17165126
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Julian Hyde commented on CALCITE-2569:
--------------------------------------
[~amaliujia], [~mmior], Could you please review
[https://github.com/julianhyde/calcite/tree/2160-spatial-grid] (contains fixes
for 2159 and 2160, and significant changes to the table function API) in the
next day or two.
> 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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