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

    https://github.com/apache/spark/pull/20295#discussion_r172583099
  
    --- Diff: python/pyspark/worker.py ---
    @@ -91,10 +92,16 @@ def verify_result_length(*a):
     
     
     def wrap_grouped_map_pandas_udf(f, return_type):
    -    def wrapped(*series):
    +    def wrapped(key_series, value_series):
             import pandas as pd
    +        argspec = inspect.getargspec(f)
    --- End diff --
    
    Good point. Let me take a look at that.


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