Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/3580#discussion_r21222327
--- Diff: core/src/main/scala/org/apache/spark/rdd/RDD.scala ---
@@ -47,6 +47,44 @@ import org.apache.spark.util.collection.OpenHashMap
import org.apache.spark.util.random.{BernoulliSampler, PoissonSampler,
BernoulliCellSampler,
SamplingUtils}
+
+object RDD {
+
+ // The following implicit functions were in SparkContext before 1.2 and
users had to
+ // `import SparkContext._` to enable them. Now we move them here to make
the compiler find
+ // them automatically. However, we still keep the old functions in
SparkContext for backward
+ // compatibility and forward to the following functions directly.
+
+ implicit def rddToPairRDDFunctions[K, V](rdd: RDD[(K, V)])
+ (implicit kt: ClassTag[K], vt: ClassTag[V], ord: Ordering[K] = null):
PairRDDFunctions[K, V] = {
+ new PairRDDFunctions(rdd)
+ }
+
+ implicit def rddToAsyncRDDActions[T: ClassTag](rdd: RDD[T]):
AsyncRDDActions[T] = {
+ new AsyncRDDActions(rdd)
+ }
+
+ implicit def rddToSequenceFileRDDFunctions[K <% Writable: ClassTag, V <%
Writable: ClassTag](
+ rdd: RDD[(K, V)]): SequenceFileRDDFunctions[K, V] = {
+ new SequenceFileRDDFunctions(rdd)
+ }
+
+ implicit def rddToOrderedRDDFunctions[K : Ordering : ClassTag, V:
ClassTag](rdd: RDD[(K, V)])
+ : OrderedRDDFunctions[K, V] = {
--- End diff --
should be `OrderedRDDFunctions[K, V, (K, V)]`
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