Github user davies commented on the pull request:
https://github.com/apache/spark/pull/2093#issuecomment-53378632
If N (top) > S(total), sort() will be SlogS, MaxHeapQ will keep all of
them, so it's also S * logS (logS is swap), they have same CPU time in
algorithm.
@ScrapCodes Sorry, I misunderstood it. your are right, it's max heap.
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