Github user zjffdu commented on a diff in the pull request:

    https://github.com/apache/spark/pull/9766#discussion_r83159425
  
    --- Diff: python/pyspark/sql/context.py ---
    @@ -202,6 +202,32 @@ def registerFunction(self, name, f, 
returnType=StringType()):
             """
             self.sparkSession.catalog.registerFunction(name, f, returnType)
     
    +    @ignore_unicode_prefix
    +    @since(2.1)
    +    def registerJavaFunction(self, name, javaClassName, returnType=None):
    +        """Register a java UDF so it can be used in SQL statements.
    +
    +        In addition to a name and the function itself, the return type can 
be optionally specified.
    +        When the return type is not given it would infer the returnType 
via reflection.
    --- End diff --
    
    Fixed


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