Github user greghogan commented on the pull request: https://github.com/apache/flink/pull/1956#issuecomment-220147037 I also like @vasia's idea since we might get to add the analytic `DyadicCensus` (basically counting how many edges are `u <-> v` and `u -> v`). The relative performance of this implementation will depend on the ratio of mutual edges. Are there one or more canonical data sets for running a comparison? The two extremes are an undirected graph and a graph with no mutual edges, which could be artificially constructed. Also, I recommend copying the current code into a new class to test a new implementation.
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