Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/1312#issuecomment-48372204
I think this patch is correct, but I'm not convinced that we need to make
these kind of optimizations at the expense of code complexity / length. I'd
imagine the performance benefit of this change is negligible and AFAICT it
produces the same result as the original code.
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