Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19617#discussion_r147995905
--- Diff: python/pyspark/sql/functions.py ---
@@ -2185,6 +2185,12 @@ def udf(f=None, returnType=StringType()):
duplicate invocations may be eliminated or the function may even
be invoked more times than
it is present in the query.
+ .. note:: The user-defined functions do not support conditional
execution by using them with
+ SQL conditional expressions such `when` or `if`. The functions
still apply on all rows no
--- End diff --
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