Github user mushketyk commented on the issue:
https://github.com/apache/flink/pull/2564
@greghogan @vasia I've update the code according to your suggestion.
The only thing that I did differently: I return Tuple4 from a more complete
version of a bottom/top projections it contains vertex key, vertex value and
values of two vertices. I assumed that to get values of two other vertices I
would need to perform two other joins which will make the method much slower,
while a user can do with the result of the method if needed.
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