Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20141#discussion_r159439756
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/expressions/UserDefinedFunction.scala
---
@@ -66,6 +66,7 @@ case class UserDefinedFunction protected[sql] (
*
* @since 1.3.0
*/
+ @scala.annotation.varargs
--- End diff --
to make it java friendly, or shall we create a new method for java?
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