Github user davies commented on the pull request:
https://github.com/apache/spark/pull/9661#issuecomment-157190597
@srowen If we are going to use RoaringBitmap, then #9243 does not really
fix SPARK-11016. It introduce a performance regression for common workload
(when only a few blocks are empty, the memory consumption of MapStatue is
bigger than before), so I don't think branch 1.6 is in healthy state now.
Since SPARK-11016 is a bug fix, it's still OK to fix even 1.6 preview is
published.
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