[jira] [Created] (FLINK-1486) Add a string to the print method to identify output

["Max Michels (JIRA)" <ji...@apache.org>]

Max Michels created FLINK-1486:
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             Summary: Add a string to the print method to identify output
                 Key: FLINK-1486
                 URL: https://issues.apache.org/jira/browse/FLINK-1486
             Project: Flink
          Issue Type: Improvement
          Components: Local Runtime
            Reporter: Max Michels
            Priority: Minor


The output of the {{print}} method of {[DataSet}} is mainly used for debug purposes. Currently, it is difficult to identify the output.

I would suggest to add another {{print(String str)}} method which allows the user to supply a String to identify the output. This could be a prefix before the actual output or a format string (which might be an overkill).

{code}
DataSet data = env.fromElements(1,2,3,4,5);
{code}

For example, {{data.print("MyDataSet: ")}} would output print

{noformat}
MyDataSet: 1
MyDataSet: 2
...
{noformat}



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