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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