Github user icexelloss commented on a diff in the pull request:
https://github.com/apache/spark/pull/20217#discussion_r160858810
--- Diff: python/pyspark/sql/catalog.py ---
@@ -255,26 +255,67 @@ def registerFunction(self, name, f,
returnType=StringType()):
>>> _ = spark.udf.register("stringLengthInt", len, IntegerType())
>>> spark.sql("SELECT stringLengthInt('test')").collect()
[Row(stringLengthInt(test)=4)]
+ """
+
+ # This is to check whether the input function is a wrapped/native
UserDefinedFunction
+ if hasattr(f, 'asNondeterministic'):
--- End diff --
It might be better to check `f` is (1) callable (2) not a UDF object
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