asmello 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_r266336079
##########
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:
`_create_column_function` or `_create_function_over_column`. Mathematically,
if a function is defined over real numbers, we'd call it a "real function" or a
"function over real numbers". This is the same principle.
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