Github user lemire commented on the pull request:
https://github.com/apache/spark/pull/2470#issuecomment-56309772
@rxin We are currently working with the Druid.io guys to integrate Roaring
(http://roaringbitmap.org). We get good results and even support memory mapped
bitmaps (with ByteBuffer).
At this point, I would recommend you try out roaring. I am available to
help.
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