Github user greghogan commented on the pull request:
https://github.com/apache/flink/pull/1671#issuecomment-215474401
@StephanEwen in [FLINK-3768](https://github.com/apache/flink/pull/1896) I
compared an optimal algorithm to the current implementation in Gelly and the
optimal algorithm was 53% faster. There is some additional complexity in the
optimal algorithm that I have since removed so I'd expect it to be about 60%
faster.
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