Github user zjffdu commented on the issue:
https://github.com/apache/spark/pull/17222
@holdenk The link you pasted is for the case that using scala closure to
create udf. While `registerJava` use java reflection to create udf. This is
what I use in `registerJava`
https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/UDFRegistration.scala#L528
It returns Unit.
Maybe it is possible to create `registerScala` to return scala udf. But it
seems it is not possible for java udf.
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