Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15889#discussion_r88611836
--- Diff: core/src/main/scala/org/apache/spark/api/java/JavaPairRDD.scala
---
@@ -234,6 +234,9 @@ class JavaPairRDD[K, V](val rdd: RDD[(K, V)])
* In addition, users can control the partitioning of the output RDD,
the serializer that is use
* for the shuffle, and whether to perform map-side aggregation (if a
mapper can produce multiple
* items with the same key).
+ *
+ * @note V and C can be different -- for example, one might group a RDD
of type (Int, Int) into
+ * an RDD of type (Int, List[Int]).
--- End diff --
It seems fine now.
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