Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18906#discussion_r159349251
--- 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.
+
+ .. versionadded:: 2.4
+ """
+ self.nullable = False
+ return self._wrapped()
--- End diff --
So, this way then seems always returning the wrapped function now? Can we
make a wrapper function for `asNondeterministic` returning the wrapped func
when we assign this function to the wrapped function above (and here
`UserDefinedFunction` returns `self`)?
I think the wrapped func returns a wrapped func and `UserDefinedFunction`
returns `UserDefinedFunction` always.
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