Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20288#discussion_r161964738
--- Diff: python/pyspark/sql/session.py ---
@@ -778,6 +778,146 @@ def __exit__(self, exc_type, exc_val, exc_tb):
self.stop()
+class UDFRegistration(object):
--- End diff --
shall we put it in `udf.py`?
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