Github user jodersky commented on the issue:
https://github.com/apache/spark/pull/14359
@jkbradley , you can find the scaladoc on stacks here
http://www.scala-lang.org/api/current/index.html#scala.collection.mutable.Stack
Also this document
http://docs.scala-lang.org/overviews/collections/performance-characteristics
gives a nice overview of the different collection types in scala and their
performances
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