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https://issues.apache.org/jira/browse/FLINK-6334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15991543#comment-15991543
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ASF GitHub Bot commented on FLINK-6334:
---------------------------------------

Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/3791#discussion_r114198865
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/api/scala/package.scala
 ---
    @@ -90,4 +91,7 @@ package object scala extends 
ImplicitExpressionConversions {
         tableEnv.toDataStream[Row](table)
       }
     
    +  implicit def tableFunctionCall2Table[T](tf: TableFunction[T]): 
TableFunctionConversions[T] = {
    --- End diff --
    
    We should also add tests to validate that these cases are properly handled.


> Refactoring UDTF interface
> --------------------------
>
>                 Key: FLINK-6334
>                 URL: https://issues.apache.org/jira/browse/FLINK-6334
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Ruidong Li
>            Assignee: Ruidong Li
>
> The current UDTF leverages the table.join(expression) interface, which is not 
> a proper interface in terms of semantics. We would like to refactor this to 
> let UDTF use table.join(table) interface. Very briefly,  UDTF's apply method 
> will return a Table Type, so Join(UDTF('a, 'b, ...) as 'c) shall be viewed as 
> join(Table)



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