Github user ahirreddy commented on the pull request:
https://github.com/apache/spark/pull/8709#issuecomment-139419889
The problem with explicitly setting a different Scala version for build
files is that SBT expects plugins and build files to be compiled against the
same version of Scala it is running on, otherwise it's possible to run into
errors (`NoSuchMethodError` or `ClassNotFoundException`) that arise from
changes in Scala.
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