Github user marmbrus commented on a diff in the pull request:
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/UDFRegistration.scala ---
    @@ -414,6 +418,84 @@ class UDFRegistration private[sql] (functionRegistry: 
FunctionRegistry) extends
    +   * Register a Java UDF class using reflection, for use from pyspark
    +   *
    +   * @param name   udf name
    +   * @param className   fully qualified class name of udf
    +   * @param returnDataType  return type of udf. If it is null, spark would 
try to infer
    +   *                        via reflection.
    +   */
    +  def registerJava(name: String, className: String, returnDataType: 
DataType): Unit = {
    --- End diff --
    Is it possible to make this non-public?  I believe we do this in other 
cases for code only called from python.

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