Github user HeartSaVioR commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22010#discussion_r209230438
  
    --- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
    @@ -396,7 +396,16 @@ abstract class RDD[T: ClassTag](
        * Return a new RDD containing the distinct elements in this RDD.
        */
       def distinct(numPartitions: Int)(implicit ord: Ordering[T] = null): 
RDD[T] = withScope {
    -    map(x => (x, null)).reduceByKey((x, y) => x, numPartitions).map(_._1)
    +    // If the data is already approriately partioned with a known 
partioner we can work locally.
    --- End diff --
    
    nit: partioned -> partitioned, partioner -> partitioner


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