Github user aaronjosephs commented on the pull request:
https://github.com/apache/spark/pull/1381#issuecomment-55604431
@JoshRosen this isn't necessarily specified on the ticket but it's related.
Since most of the time something will be range partitioned because you called
sortByKey on it this could actually be even more efficient (if cached) on
smaller data sets if you glommed the partition and did a binary search on the
array. I'm not sure if the glomming overhead would outweigh the benefits of the
binary search, I'd like to know if you have any opinions on this
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