[jira] [Created] (FLINK-7152) use CombineOutputSelector instead of outputSelector list

["Xu Pingyong (JIRA)" <ji...@apache.org>]

Xu Pingyong created FLINK-7152:
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             Summary: use CombineOutputSelector instead of outputSelector list
                 Key: FLINK-7152
                 URL: https://issues.apache.org/jira/browse/FLINK-7152
             Project: Flink
          Issue Type: Improvement
          Components: DataStream API
            Reporter: Xu Pingyong
            Assignee: Xu Pingyong


There is a list of  outputSelector in streamNode and streamOperator. 
Every outputSelector returns  a string list:
  
{code:java}
 Iterable<String> select(OUT value);
{code}

then string results of all  outputSelectors will be unioned in the streamTask when outputing a record.

So I want to introduce CombineOutputSelector to union these results, and only one OutputSelector is needed in streamNode and streamOperator.



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