Github user fhueske commented on the issue:
https://github.com/apache/flink/pull/3547
One more thing. The PR includes a merge commit which makes squashing the
commits and merging the PR a lot more difficult (see also the [contribution
guidelines](http://flink.apache.org/contribute-code.html#coding-guidelines)).
You can avoid merge commits if you branch from the master and just put
commits on top. If you want to include somebody else's work, you can use `git
cherry-pick` to pull over a commit. Use `git rebase` to rebase your commits on
the latest master.
Best, Fabian
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