Github user asfgit closed the pull request at:
https://github.com/apache/incubator-gearpump/pull/51
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GitHub user darionyaphet opened a pull request:
https://github.com/apache/incubator-gearpump/pull/51
[GEARPUMP-166] Rename sumByValue to sumByKey
[GEARPUMP-166](https://issues.apache.org/jira/browse/GEARPUMP-166)
Streaming org.apache.gearpump.streaming.dsl.Stream have a func
