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Scala map smoothing in RDD

I have an RDD that looks like this:

uidProcessedKeywords: org.apache.spark.rdd.RDD[(Long, Map[String,Double])]

How to flatten the map in RDD to get this:

org.apache.spark.rdd.RDD[(Long, String, Double)]
+3


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1 answer 


val x = sc.parallelize(List((2, Map("a" -> 0.2, "b" -> 0.3))))
x.flatMap { 
    case (id, m) => m.map { case (k, v) => (id, k, v)}
  }
 .collect()
res1: Array[(Int, String, Double)] = Array((2,a,0.2), (2,b,0.3))


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