Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/16533#discussion_r97911192
--- Diff: python/pyspark/sql/functions.py ---
@@ -1847,8 +1848,7 @@ def __call__(self, *cols):
return Column(jc)
-@since(1.3)
-def udf(f, returnType=StringType()):
+def _udf(f, returnType=StringType()):
"""Creates a :class:`Column` expression representing a user defined
function (UDF).
.. note:: The user-defined functions must be deterministic. Due to
optimization,
--- End diff --
Even though we've got this with an _ maybe through in the docstring its for
internal use only? Also since this is for internal use only maybe most of this
should be moved to the public udf function now instead of on the internal only
method?
Unless we intend for users to call `_udf` in which case we need to give it
a different name.
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