Github user vasia commented on the pull request:
https://github.com/apache/flink/pull/1956#issuecomment-221394386
Hey @gallenvara,
I had a private chat with @greghogan about this PR. We think that we should
change the label type to a boolean instead of string. It should make a
difference for large graph inputs. After this last change we'll go ahead and
finally merge this :)
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