Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/2712#issuecomment-58387498
Great catch.
A concern is that calling Array#take requires an implicit conversion, which
has some performance impact that might be unacceptable for this method that can
get called in a tight loop.
http://villane.wordpress.com/2008/02/02/learning-scala-performance-impact-of-implicit-conversions/
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