itholic commented on code in PR #37835:
URL: https://github.com/apache/spark/pull/37835#discussion_r969084848


##########
python/pyspark/pandas/tests/test_expanding.py:
##########
@@ -97,16 +97,22 @@ def test_expanding_skew(self):
     def test_expanding_kurt(self):
         self._test_expanding_func("kurt")
 
-    def _test_groupby_expanding_func(self, f):
+    def _test_groupby_expanding_func(self, ps_func, pd_func=None):
+        if not pd_func:
+            pd_func = ps_func

Review Comment:
   Sorry, I got a bit confusion for this part.
   
   Could you tell one example that considers this case?



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