Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/21383#discussion_r191406867
--- Diff: python/pyspark/sql/udf.py ---
@@ -157,7 +157,17 @@ def _create_judf(self):
spark = SparkSession.builder.getOrCreate()
sc = spark.sparkContext
- wrapped_func = _wrap_function(sc, self.func, self.returnType)
+ func = fail_on_stopiteration(self.func)
+
+ # prevent inspect to fail
+ # e.g. inspect.getargspec(sum) raises
+ # TypeError: <built-in function sum> is not a Python function
--- End diff --
nit: seems this comment should be belonging to under `except TypeError`.
Here an appropriate comment is why we need get argspec into `_argspec`.
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