Github user mengxr commented on the pull request:

    https://github.com/apache/spark/pull/11108#issuecomment-199563705
  
    I reverted the change in master to unblock other builds. @keypointt Could 
you test it on Scala 2.10? It seems that Scala 2.10 doesn't resolve keyword 
arguments nicely:
    
    ~~~scala
    def f(a: String, b: String, c: String = "xxx") = {
      println(a, b, c)
    }
    
    f(a = "abc", "def")
    <console>:34: error: not enough arguments for method f: (a: String, b: 
String, c: String)Unit.
    Unspecified value parameter b.
                  f(a = "abc", "def")
    ~~~
    
    We should either fix the seed or use keyword argument for `fractions`.


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