Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/5142#discussion_r27005643
--- Diff: graphx/src/main/scala/org/apache/spark/graphx/VertexRDD.scala ---
@@ -154,7 +154,30 @@ abstract class VertexRDD[VD](
* @return a VertexRDD containing the results of `f`
*/
def leftZipJoin[VD2: ClassTag, VD3: ClassTag]
- (other: VertexRDD[VD2])(f: (VertexId, VD, Option[VD2]) => VD3):
VertexRDD[VD3]
+ (other: VertexRDD[VD2])
+ (f: (VertexId, VD, Option[VD2]) => VD3)
+ : VertexRDD[VD3]
+
+ /**
+ * Left joins this RDD with another VertexRDD with the same index. This
function will fail if
+ * both VertexRDDs do not share the same index. The resulting vertex set
contains an entry for
--- End diff --
Is "will fail" correct? In the implementation, I think the codes fail back
to creating same indices.
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