Github user a-roberts commented on the issue:
https://github.com/apache/spark/pull/15736
@srowen how about this for profiling?
```
private[spark] object WritablePartitionedPairCollection {
/**
* Takes an optional parameter (keyComparator), use if provided
* and returns a comparator for the partitions
*/
def getComparator[K](keyComparator: Option[Comparator[K]]):
Comparator[(Int, K)] = {
if (keyComparator.isDefined) {
val theKeyComp = keyComparator.get
new Comparator[(Int, K)] {
// We know we have a non-empty comparator here
override def compare(a: (Int, K), b: (Int, K)): Int = {
if (a._1 == b._1) {
theKeyComp.compare(a._2, b._2)
} else {
a._1 - b._1
}
}
}
} else return new Comparator[(Int, K)] {
override def compare(a: (Int, K), b: (Int, K)): Int = {
a._1 - b._1
}
}
}
}
```
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