Gábor Hermann created FLINK-2303:
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             Summary: Add count method to GroupedDataStream
                 Key: FLINK-2303
                 URL: https://issues.apache.org/jira/browse/FLINK-2303
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Gábor Hermann
            Priority: Minor


As aggregations from DataStream was removed, the {{count}} method was also 
removed. A count method should be introduced to the {{GroupedDataStream<T>}} 
that returns a {{Tuple2<T, Long>}} of the latest element and number of the 
elements in the stream with the same key.



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