Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/6139#discussion_r30625360
--- Diff: python/pyspark/ml/param/__init__.py ---
@@ -147,10 +147,10 @@ def hasParam(self, paramName):
def getOrDefault(self, param):
"""
Gets the value of a param in the user-supplied param map or its
- default value. Raises an error if either is set.
+ default value. Raises an error if neither is set.
"""
param = self._resolveParam(param)
- if param in self._paramMap:
+ if param in self._paramMap and self.paramMap[param]:
--- End diff --
This was an intentional change. If something is present in the param map
but had None then we should use the default value.
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