Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/977#issuecomment-127533577
Hi,
you don't need to create a new Pull Request. You can also just push your
changes to your old branch (HuangWHWHW:FLINK-2477 in this case) and then the
Pull Request in Github will be updated. Git will complain but you can force it
to push by using:
```
git push -f FLINK-2477 HuangWHWHW
```
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