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https://issues.apache.org/jira/browse/SPARK-554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13993294#comment-13993294
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Sandy Ryza commented on SPARK-554:
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https://github.com/apache/spark/pull/705
> Add foldByKey and aggregateByKey
> --------------------------------
>
> Key: SPARK-554
> URL: https://issues.apache.org/jira/browse/SPARK-554
> Project: Spark
> Issue Type: New Feature
> Reporter: Matei Zaharia
>
> Similar to the new fold() and aggregate() methods in #95, we should have
> foldByKey and aggregateByKey for pair RDDs. The main thing that makes this
> slightly harder is that we'll have to change the combineByKey API and
> ShuffledRDD to allow taking in a "zero value".
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