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_r266333942
##########
File path: python/pyspark/sql/functions.py
##########
@@ -1450,6 +1471,8 @@ def hash(*cols):
# ---------------------- String/Binary functions ------------------------------
_string_functions = {
+ 'upper': 'Converts a string expression to upper case.',
+ 'lower': 'Converts a string expression to upper case.',
Review comment:
This will give the incorrect `since` in the documentation. These functions
were introduced in version 1.3.
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