Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/1791#discussion_r16209395
--- Diff: python/pyspark/rdd.py ---
@@ -1755,6 +1941,114 @@ def _defaultReducePartitions(self):
# on the key; we need to compare the hash of the key to the hash of the
# keys in the pairs. This could be an expensive operation, since those
# hashes aren't retained.
+ # def lookup(self, key):
+ # """
+ # Return the list of values in the RDD for key key.
+ # """
+
+ def _is_pickled(self):
+ """ Return this RDD is serialized by Pickle or not. """
+ der = self._jrdd_deserializer
+ if isinstance(der, PickleSerializer):
+ return True
+ if isinstance(der, BatchedSerializer) and
isinstance(der.serializer, PickleSerializer):
+ return True
+ return False
+
+ def _to_jrdd(self):
+ """ Return an JavaRDD """
--- End diff --
Add that this is not batched
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