Github user jkirsch commented on the pull request:
https://github.com/apache/incubator-flink/pull/187#issuecomment-62133790
Thanks for having a look at the code
Indeed the Set approach is nicer to read but there is a performance penalty
incurred
I just ran a simple caliper benchmark and on my machine the set approach is
about 10x slower, so I fixed that.
https://microbenchmarks.appspot.com/runs/b3ab8918-7226-4527-b019-c622a728d144
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