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[jira] [Created] (FLINK-9850) Add a string to the print method to identify output for DataStream


Hequn Cheng created FLINK-9850:
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             Summary: Add a string to the print method to identify output for DataStream
                 Key: FLINK-9850
                 URL: https://issues.apache.org/jira/browse/FLINK-9850
             Project: Flink
          Issue Type: New Feature
          Components: DataStream API
            Reporter: Hequn Cheng


The output of the print method of {[DataSet}} allows the user to supply a String to identify the output(see [FLINK-1486|https://issues.apache.org/jira/browse/FLINK-1486]). But {[DataStream}} doesn't support now. It is valuable to add this feature for {{DataStream}}



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