Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19872#discussion_r154644084
--- Diff: python/pyspark/sql/udf.py ---
@@ -56,6 +56,10 @@ def _create_udf(f, returnType, evalType):
return udf_obj._wrapped()
+class UDFColumn(Column):
--- End diff --
BTW, what do you think about adding an attribute instead?
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