Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/2866#issuecomment-60318489
Based on some discussion, we're going to stick with
`RoaringBitmap.contains` for now. Fancier solutions which use non-compressed
bitmaps for lookups may be faster for certain lookup patterns, but this may
cause other performance issues: each MapStatus is serialized / deserialized
twice, once when it's created by the worker and sent to the master, and once
when it's broadcast from the master to the worker, so the construction of these
additional materializations could be expensive and it could be complicated to
ensure that they're only created on the workers.
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