Github user ankurdave commented on the pull request:
https://github.com/apache/spark/pull/1903#issuecomment-52587969
This looks good! A test would be good too. VertexRDDSuite seems like the
right place, since nothing else actually calls this variant of VertexRDD.apply.
It should be OK to create an empty EdgeRDD in VertexRDDSuite for testing
purposes.
Here's a simple test:
val verts = sc.parallelize(List((0L, 1), (0L, 2), (1L, 3)))
val edges = EdgeRDD.fromEdges(sc.parallelize(List.empty[Edge[Int]]))
val rdd = VertexRDD(verts, edges, 0, (a: Int, b: Int) => a + b)
assert(rdd.collect.toSet == Set((0L, 3), (1L, 3)))
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