Github user andrewor14 commented on the pull request:
https://github.com/apache/spark/pull/6256#issuecomment-103640234
I see. From @liancheng's PR description at #6225, the 6% speed up is from
the `53s`, which is roughly `3.2s`. This is more or less consistent with what
@yhuai observed after applying this patch to his PR, where the speed up is
roughly `4.3s`.
In other words the real speed up is about 34%!
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