Github user KurtYoung commented on a diff in the pull request:
https://github.com/apache/flink/pull/3623#discussion_r108318532
--- Diff:
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/TableFunction.scala
---
@@ -131,8 +202,10 @@ abstract class TableFunction[T] extends
UserDefinedFunction {
* method. Flink's type extraction facilities can handle basic types or
--- End diff --
I think the comment should also be updated, to make user be aware of the
behavior that he can determine the result type based on the parameters.
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