Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/1791#discussion_r16267396
--- Diff: python/pyspark/rdd.py ---
@@ -1756,6 +1942,114 @@ 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.
+ # """
--- End diff --
If you'd like you can implement lookup() the same way as in Scala, it's not
too bad
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