Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/7021#discussion_r33342683 --- Diff: core/src/main/scala/org/apache/spark/rdd/PartitionerAwareUnionRDD.scala --- @@ -63,6 +63,9 @@ class PartitionerAwareUnionRDD[T: ClassTag]( require(rdds.forall(_.partitioner.isDefined)) require(rdds.flatMap(_.partitioner).toSet.size == 1, "Parent RDDs have different partitioners: " + rdds.flatMap(_.partitioner)) + require(rdds.map(_.partitioner.get.numPartitions).toSet.size == 1, --- End diff -- The partitioners of the rdds might have different `numPartitions`. It will causes error later.
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