Github user sddyljsx commented on a diff in the pull request:
https://github.com/apache/spark/pull/21859#discussion_r211130877
--- Diff: core/src/main/scala/org/apache/spark/Partitioner.scala ---
@@ -155,6 +156,8 @@ class RangePartitioner[K : Ordering : ClassTag, V](
private var ordering = implicitly[Ordering[K]]
+ private var sampledArray: Array[K] = _
--- End diff --
Yes, this will be better
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