Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/21435#discussion_r191038840
--- Diff: python/pyspark/sql/functions.py ---
@@ -2448,6 +2448,8 @@ def udf(f=None, returnType=StringType()):
@since(2.3)
def pandas_udf(f=None, returnType=None, functionType=None):
"""
+ .. note:: Experimental
+
--- End diff --
BTW, don't forget to update `group.apply()`.
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