huonw opened a new pull request #23681: [SPARK-26757][GraphX] Return 0 for `count` on empty Edge/Vertex RDDs URL: https://github.com/apache/spark/pull/23681 ## What changes were proposed in this pull request? Previously a "java.lang.UnsupportedOperationException: empty collection" exception would be thrown due to using `reduce`, rather than `fold` or similar that can tolerate empty RDDs. This behaviour has existed for the Vertex RDDs since it was introduced in b30e0ae0351be1cbc0b1cf179293587b466ee026. It seems this behaviour was inherited by the Edge RDDs via copy-paste in ee29ef3800438501e0ff207feb00a28973fc0769. ## How was this patch tested? Two new unit test. Please review http://spark.apache.org/contributing.html before opening a pull request.
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