Github user mridulm commented on a diff in the pull request: https://github.com/apache/spark/pull/22010#discussion_r220674444 --- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala --- @@ -396,7 +397,20 @@ 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) + def removeDuplicatesInPartition(partition: Iterator[T]): Iterator[T] = { + // Create an instance of external append only map which ignores values. + val map = new ExternalAppendOnlyMap[T, Null, Null]( + createCombiner = value => null, + mergeValue = (a, b) => a, + mergeCombiners = (a, b) => a) --- End diff -- scratch that - does not matter
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