Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/97#issuecomment-37479507
takeOrdered should always return the smallest elements according to the
ordering, so it's not the same as top. For example takeOrdered(2) on [1,2,3,4]
should return [1,2]. But takeOrdered(2, lambda key: -key) on [1,2,3,4] should
return [4,3].
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