huonw commented on a change in pull request #23681: [SPARK-26757][GraphX]
Return 0 for `count` on empty Edge/Vertex RDDs
URL: https://github.com/apache/spark/pull/23681#discussion_r252518240
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File path: graphx/src/main/scala/org/apache/spark/graphx/impl/EdgeRDDImpl.scala
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@@ -87,7 +87,7 @@ class EdgeRDDImpl[ED: ClassTag, VD: ClassTag]
private[graphx] (
/** The number of edges in the RDD. */
override def count(): Long = {
- partitionsRDD.map(_._2.size.toLong).reduce(_ + _)
+ partitionsRDD.map(_._2.size.toLong).fold(0)(_ + _)
Review comment:
Indeed it does. I've switched that to `fold` too.
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