Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18906#discussion_r159349953
--- Diff: python/pyspark/sql/udf.py ---
@@ -174,3 +178,12 @@ def asNondeterministic(self):
"""
self._deterministic = False
return self
+
+ def asNonNullable(self):
+ """
+ Updates UserDefinedFunction to non-nonullable.
--- End diff --
`UserDefinedFunction ` -> `` :class:`UserDefinedFunction` ``
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