HyukjinKwon commented on a change in pull request #24121: 
[SPARK-26979][PYTHON][FOLLOW-UP] Make binary math/string functions take string 
as columns as well
URL: https://github.com/apache/spark/pull/24121#discussion_r266351792
 
 

 ##########
 File path: python/pyspark/sql/functions.py
 ##########
 @@ -48,8 +55,11 @@ def _(col):
     return _
 
 
-def _create_function(name, doc=""):
-    """ Create a function that takes a Column object, by name"""
+def _create_function_with_column(name, doc=""):
 
 Review comment:
   okie. Let me fix it to over.

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