Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/7285#discussion_r34137453
--- Diff: core/src/main/scala/org/apache/spark/rdd/CoalescedRDD.scala ---
@@ -78,6 +78,10 @@ private[spark] class CoalescedRDD[T: ClassTag](
balanceSlack: Double = 0.10)
extends RDD[T](prev.context, Nil) { // Nil since we implement
getDependencies
+ if (maxPartitions < 1) {
--- End diff --
Although I think you could use `require()` here, the change itself LGTM. I
don't see a reason to allow repartitioning to 0 partitions.
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