Github user jodersky commented on the issue:
https://github.com/apache/spark/pull/14359
> I switched to Stack and then realized Stack has been deprecated in Scala
2.11...
I think you probably read the *immutable* stack docs; the *mutable* stack
is not deprecated AFAIK. I can imagine that having a custom stack
implementation may allow for additional operations in the future, however we
should also consider that using standard collections reduces the load for
anyone who will maintain the code then.
Btw, I highly recommend to use the [milestone
scaladocs](http://www.scala-lang.org/api/2.12.0-M5/scala/collection/mutable/Stack.html)
over the current ones. Although 2.12 is not officially out yet, the changes to
the library are minimal and the UI is much more pleasant to use.
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