Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/3671#discussion_r21668908
--- Diff: core/src/main/scala/org/apache/spark/rdd/PairRDDFunctions.scala
---
@@ -493,9 +493,9 @@ class PairRDDFunctions[K, V](self: RDD[(K, V)])
def leftOuterJoin[W](other: RDD[(K, W)], partitioner: Partitioner):
RDD[(K, (V, Option[W]))] = {
this.cogroup(other, partitioner).flatMapValues { pair =>
if (pair._2.isEmpty) {
- pair._1.map(v => (v, None))
+ pair._1.iterator.map(v => (v, None): (V, Option[W]))
--- End diff --
Interesting, are these types required? or can it be limited to just
changing `None` to `None: Option[W]`?
Not that it hurts to spell out the types.
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