Github user mridulm commented on a diff in the pull request:
https://github.com/apache/spark/pull/15736#discussion_r86173509
--- Diff:
core/src/main/scala/org/apache/spark/util/collection/PartitionedAppendOnlyMap.scala
---
@@ -30,7 +30,21 @@ private[spark] class PartitionedAppendOnlyMap[K, V]
def partitionedDestructiveSortedIterator(keyComparator:
Option[Comparator[K]])
: Iterator[((Int, K), V)] = {
- val comparator =
keyComparator.map(partitionKeyComparator).getOrElse(partitionComparator)
+ val comparator : Comparator[(Int, K)] =
+ if (keyComparator.isEmpty) {
+ partitionComparator
+ } else {
+ new Comparator[(Int, K)] {
+ override def compare(a: (Int, K), b: (Int, K)): Int = {
+ val partitionDiff = a._1 - b._1
+ if (partitionDiff != 0) {
+ partitionDiff
+ } else {
+ keyComparator.get.compare(a._2, b._2)
+ }
--- End diff --
You can dereference the option to avoid get in inner loop
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