Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/266#issuecomment-39677970
For the OpenHashMap null lower bound, it should be fine to drop the lower
bound (based on my 30 sec check).
The original intention was that if the key is primitive (non-null),
PrimitiveKeyOpenHashMap.scala should be used. Maybe we can have a factory
method to help users choose.
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