Github user fommil commented on the pull request:
https://github.com/apache/incubator-spark/pull/575#issuecomment-35446562
@rxin I've not seen implicits to cause a problem, except in high frequency
scenarios. I suspect Breeze might have suffered from auto boxing, brought on by
implicit use, which Spire (and a new compiler plugin) is trying to address and
where specialized failed
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