Github user lemire commented on the pull request: https://github.com/apache/spark/pull/9243#issuecomment-150947477 @srowen Trying to compress something that is tiny and otherwise incompressible can indeed lead to a storage increase of the order of 20%. That's credible. But even if the 20% was in the other direction... that is, the compressed bitmaps were 20% smaller, it would still not be worth it to compress in general. RAM and storage are not that expensive in 2015. We use compressed bitmaps when uncompressed ones are many times larger (at least 2x). Then you get both less memory usage and faster processing speed.
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