Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19929#discussion_r158599004
--- Diff: python/pyspark/sql/functions.py ---
@@ -2075,9 +2075,10 @@ class PandasUDFType(object):
def udf(f=None, returnType=StringType()):
"""Creates a user defined function (UDF).
- .. note:: The user-defined functions must be deterministic. Due to
optimization,
+ .. note:: The user-defined functions are considered deterministic. Due
to optimization,
--- End diff --
`... are considered deterministic by default.`
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