Github user rxin commented on the pull request:
https://github.com/apache/incubator-spark/pull/575#issuecomment-35445845
@fommil maybe that changed in 2.10.x entirely given the addition of value
classes, and maybe Breeze is very careful in its implicit usage, but often
implicits in scala 2.9.x can be super confusing and result in creation of new
objects that are not obvious and can be a performance killer.
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