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Oct 18th, 2017
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  1. case class Measurement(nb:Long,x:Double)
  2.  
  3. ds.map{m => (m,sum($"x").over(Window.orderBy($"nb"))}
  4.  
  5. ds.withColumn("cumsum",sum($"x").over(Window.orderBy($"nb")))
  6.  
  7. ds.withColumn("cumsum",sum($"x").over(Window.orderBy($"nb"))).as[(Measurement,Column)]
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