Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/4972#issuecomment-78257987
The micro-benchmark definitely shows the alternative code is faster,
although it only benchmarks the time taken in this one method. The question is
how much of the overall time is consumed by a simple array length check. Your
first test is more convincing, although the difference seems quite a bit larger
than I'd expect. Wow, does it really get called so much / the native overhead
is that big?
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