[GitHub] [spark] asmello commented on a change in pull request #23882: [SPARK-26979][PYTHON] Add missing string column name support for some SQL functions

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asmello commented on a change in pull request #23882: [SPARK-26979][PYTHON] Add missing string column name support for some SQL functions
URL: https://github.com/apache/spark/pull/23882#discussion_r261973265
 
 

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 File path: python/pyspark/sql/functions.py
 ##########
 @@ -48,6 +48,17 @@ def _(col):
     return _
 
 
+def _create_function(name, doc=""):
+    """ Create a column-based function by name"""
 
 Review comment:
   I did test it manually; isn't that what it says?

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