apache/spark — pull request #2839 by aarondav (2014-10-17 22:16:04+00:00)
Title: [SPARK-3994] Use standard Aggregator code path for countByKey and countByValue

See [JIRA](https://issues.apache.org/jira/browse/SPARK-3994) for more information. Also adds
a note which warns against using these methods.