Github user mridulm commented on a diff in the pull request: https://github.com/apache/spark/pull/20002#discussion_r158108582 --- Diff: core/src/main/scala/org/apache/spark/Partitioner.scala --- @@ -57,7 +60,8 @@ object Partitioner { def defaultPartitioner(rdd: RDD[_], others: RDD[_]*): Partitioner = { val rdds = (Seq(rdd) ++ others) val hasPartitioner = rdds.filter(_.partitioner.exists(_.numPartitions > 0)) - if (hasPartitioner.nonEmpty) { + if (hasPartitioner.nonEmpty + && isEligiblePartitioner(hasPartitioner.maxBy(_.partitions.length), rdds)) { --- End diff -- `hasPartitioner.maxBy(_.partitions.length)` is used repeatedly, pull that into a variable ?
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