Makes UDFs work with all types of callables

Author: ksonj

python/pyspark/sql/functions.py

@@ -123,7 +123,8 @@ def _create_judf(self):
         pickled_command, broadcast_vars, env, includes = _prepare_for_python_RDD(sc, command, self)
         ssql_ctx = sc._jvm.SQLContext(sc._jsc.sc())
         jdt = ssql_ctx.parseDataType(self.returnType.json())
-        judf = sc._jvm.UserDefinedPythonFunction(f.__repr__(), bytearray(pickled_command), env,
+        fname = f.__name__ if hasattr(f, '__name__') else f.__class__.__name__
+        judf = sc._jvm.UserDefinedPythonFunction(fname, bytearray(pickled_command), env,
                                                  includes, sc.pythonExec, broadcast_vars,
                                                  sc._javaAccumulator, jdt)
         return judf