Github user holdenk commented on the issue: https://github.com/apache/spark/pull/17222 @zjffdu - if you look at https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/UDFRegistration.scala#L129 though it returns the `UserDefinedFunction` (currently the Python one is Unit but it would be more useful if it returned a `UserDefinedFunction`). I think to make it easier for people to take advantage of Java UDFs we would want them to be able to use it programmatic ally in the Dataframe DSL not just in SQL string expressions. What do you think @gatorsmile & @zjffdu ?
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