Github user mateiz commented on a diff in the pull request:
https://github.com/apache/spark/pull/931#discussion_r13315338
--- Diff:
core/src/main/scala/org/apache/spark/util/collection/ExternalAppendOnlyMap.scala
---
@@ -61,14 +61,15 @@ class ExternalAppendOnlyMap[K, V, C](
createCombiner: V => C,
mergeValue: (C, V) => C,
mergeCombiners: (C, C) => C,
+ customizedComparator: Comparator[(K, C)] = null,
--- End diff --
Add this parameter at the end of the argument list to make it more likely
to be compatible with code written earlier
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