Github user zero323 commented on a diff in the pull request:
https://github.com/apache/spark/pull/16536#discussion_r98542899
--- Diff: python/pyspark/sql/functions.py ---
@@ -1826,19 +1826,27 @@ class UserDefinedFunction(object):
def __init__(self, func, returnType, name=None):
self.func = func
self.returnType = returnType
- self._judf = self._create_judf(name)
-
- def _create_judf(self, name):
+ self._judf_placeholder = None
+ self._name = name or (
+ func.__name__ if hasattr(func, '__name__')
+ else func.__class__.__name__)
+
+ @property
+ def _judf(self):
+ if self._judf_placeholder is None:
--- End diff --
@holdenk Done.
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