Github user hhbyyh commented on the pull request:
https://github.com/apache/spark/pull/3997#issuecomment-70270369
@mengxr I did some further test and find the perf difference caused by the
heap access. Thanks for pointing it out.
Sent an update containing the locality improvement. @srowen you may notice
I changed the implementation back a little and uses the allEqual inspired by
@mengxr :)
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