Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20900#discussion_r176930776
--- Diff: python/pyspark/sql/functions.py ---
@@ -2155,6 +2155,8 @@ def udf(f=None, returnType=StringType()):
in boolean expressions and it ends up with being executed all
internally. If the functions
can fail on special rows, the workaround is to incorporate the
condition into the functions.
+ .. note:: The user-defined functions do not take keyword arguments.
--- End diff --
Let's add `on the calling side` (I meant not on function declaration side)
at the end for clarification.
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