Github user mgaido91 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21333#discussion_r196541591
--- Diff: core/src/test/scala/org/apache/spark/rdd/RDDSuite.scala ---
@@ -154,6 +154,13 @@ class RDDSuite extends SparkFunSuite with
SharedSparkContext {
}
}
+ test("SPARK-23778: empty RDD in union should not produce a UnionRDD") {
--- End diff --
added, thanks.
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