Github user zero323 commented on a diff in the pull request:
https://github.com/apache/spark/pull/16533#discussion_r98204474
--- 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 --
If we don't mind some discrepancy between docstring and usage (like I
mentioned I believe that documenting internals with switching between decorator
with partial and full application won't do us any good here) it can be pushed
as an internal helper into `udf`.
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