itholic commented on a change in pull request #34886:
URL: https://github.com/apache/spark/pull/34886#discussion_r769269607



##########
File path: python/pyspark/pandas/groupby.py
##########
@@ -3327,15 +3326,9 @@ def normalize_keyword_aggregation(
     Examples
     --------
     >>> normalize_keyword_aggregation({'output': ('input', 'sum')})
-    (OrderedDict([('input', ['sum'])]), ['output'], [('input', 'sum')])
+    (defaultdict(<class 'list'>, {'input': ['sum']}), ['output'], [('input', 
'sum')])

Review comment:
       Then we maybe should address the description in the line 3310-3311 ?
   
   From
   `Transforms from the new ``Dict[str, NamedAgg]`` style kwargs to the old 
OrderedDict[str, List[scalar]]].`
   to
   `Transforms from the new ``Dict[str, NamedAgg]`` style kwargs to the old 
defaultdict[str, List[scalar]]].`
   
   ?




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