Github user dbtsai commented on the pull request:
https://github.com/apache/spark/pull/3288#issuecomment-63566328
(PS, when I did the bytecode analysis, I found that accessing the
member variables of values and values.size require two operation.
By having a local copy of reference to make it as single call, there is
another 8% performance gain. See
http://stackoverflow.com/questions/6602922/is-it-faster-to-access-final-local-variables-than-class-variables-in-java
for detail)
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