Github user hsaputra commented on the pull request:
https://github.com/apache/flink/pull/324#issuecomment-70715529
I rename the file from coGroupDataSet.scala to CoGroupDataSet.scala and
crossDataSet.scala to CrossDataSet.scala to follow convention Scala file naming.
And move out UnfinishedCoGroupOperation class because it is a high level
public class by itself and not dependent on CoGroupOperation as sealed trait.
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