Github user aarondav commented on a diff in the pull request:
https://github.com/apache/spark/pull/369#discussion_r13418102
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -423,6 +423,18 @@ abstract class RDD[T: ClassTag](
def ++(other: RDD[T]): RDD[T] = this.union(other)
/**
+ * Return this RDD sorted by the given key function.
+ */
+ def sortBy[K](
+ f: (T) â K,
+ ascending: Boolean = true,
+ numPartitions: Int = this.partitions.size)
+ (implicit ord: Ordering[K], ctag: ClassTag[K]): RDD[T] =
--- End diff --
Look at the discussion at the beginning of this PR, but the reason for this
is related to the fact that the user may want to actually specify the Ordering
explicitly, so we didn't want the sugar. Also you can't include both a context
bound for ClassTag and an implicit argument list, I believe.
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