Github user aarondav commented on the pull request:
https://github.com/apache/spark/pull/1502#issuecomment-49566043
The "added public classes" are private[spark] and package-private to
org.apache.spark.util, repsectively.
@mateiz Please take a brief look at the API to make sure it's still
suitable for your SizeTrackingCollection's destructiveSortedIterator. The only
major change to that API was that the Comparator now only takes the key instead
of a (K, C) pair.
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