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https://issues.apache.org/jira/browse/FLINK-6334?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15991544#comment-15991544
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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_r114197458
--- 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 --
This allows to use table functions everywhere where a Table is expected,
e.g., in `union`, `intersect`, `minus`, `rightOuterJoin` and `fullOuterJoin`.
We should check these cases and throw a good exception explaining that
TableFunctions are currently only supported for leftJoin and join.
> 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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