Github user markhamstra commented on a diff in the pull request:
https://github.com/apache/spark/pull/369#discussion_r13419732
--- 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 --
If I understand what you are claiming, then I think you are mistaken.
There is only one implicit parameter list, though, so I don't think you can
supply an argument for only one of the implicits:
```
scala> def foo[A: ClassTag](implicit ord: Ordering[A]) =
(implicitly[ClassTag[A]], ord)
foo: [A](implicit evidence$1: scala.reflect.ClassTag[A], implicit ord:
scala.math.Ordering[A])(scala.reflect.ClassTag[A], scala.math.Ordering[A])
scala> foo[Int]
res1: (scala.reflect.ClassTag[Int], scala.math.Ordering[Int]) =
(Int,scala.math.Ordering$Int$@5e10a811)
scala> foo[Int](scala.reflect.classTag[Int], Ordering[Int])
res2: (scala.reflect.ClassTag[Int], scala.math.Ordering[Int]) =
(Int,scala.math.Ordering$Int$@5e10a811)
scala> foo[Int](scala.reflect.classTag[Int], Ordering[Int].reverse)
res3: (scala.reflect.ClassTag[Int], scala.math.Ordering[Int]) =
(Int,scala.math.Ordering$$anon$4@7293296)
```
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