Github user chiwanpark commented on the pull request:
https://github.com/apache/flink/pull/572#issuecomment-94512484
I updated this PR. Thanks for advice. :)
* Remove `setParallelism(1)` in test code.
* Simplify `testGroupReduceWithAtomicValue` in `GroupReduceITCase`.
* Add a `null` check for `expressionsIn` in constructor of `ExpressionKeys`.
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