Github user vlyubin commented on the pull request:
https://github.com/apache/spark/pull/5279#issuecomment-88304259
Here are the benchmark numbers:
http://pastie.org/private/6vg7kg2yfwop2ov5zu2eq
TLDR: On real cluster the new implementation made `rdd()` 1.9 times faster
and `toDF()` 2.2 times faster.
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