Github user e-dorigatti commented on a diff in the pull request:
https://github.com/apache/spark/pull/21467#discussion_r192116000
--- Diff: python/pyspark/worker.py ---
@@ -69,6 +69,7 @@ def chain(f, g):
def wrap_udf(f, return_type):
+ f = fail_on_stopiteration(f)
--- End diff --
Or just move the call to `get_argspec` in `read_single_udf`
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