Github user zsxwing commented on a diff in the pull request:
https://github.com/apache/spark/pull/3505#discussion_r21147642
--- Diff: core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
---
@@ -481,9 +481,203 @@ class PairRDDFunctions[K, V](self: RDD[(K, V)])
* (k, v2) is in `other`. Uses the given Partitioner to partition the
output RDD.
*/
def join[W](other: RDD[(K, W)], partitioner: Partitioner): RDD[(K, (V,
W))] = {
--- End diff --
A better signature of `join` is `def join[W: ClassTag](other: RDD[(K, W)],
partitioner: Partitioner): RDD[(K, (V, W))]`. However, it's a breaking change,
so I don't change it.
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