Github user chiwanpark commented on the pull request:
https://github.com/apache/flink/pull/1098#issuecomment-141629844
There is a checkstyle error:
```
[INFO] There is 1 error reported by Checkstyle 6.2 with
/tools/maven/checkstyle.xml ruleset.
[ERROR]
src/main/java/org/apache/flink/streaming/api/datastream/DataStream.java[992]
(regexp) RegexpSinglelineJava: Line has leading space characters; indentation
should be performed with tabs only.
```
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