Github user chenqin closed the pull request at:
https://github.com/apache/flink/pull/2982
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GitHub user chenqin opened a pull request:
https://github.com/apache/flink/pull/2982
[FLINK-4460] Side Outputs in Flink
[FLIP-13](https://cwiki.apache.org/confluence/display/FLINK/FLIP-13+Side+Outputs+in+Flink)
Expose sideOutput with `OutputTag`,
For those userFunction pr
