Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/2564
Agreed, I would amend my earlier suggestion to say we only need to start
with two projection methods (for each of top and bottom), something like
`public Graph<TK, TVV, Tuple2<EV, EV>> topProjectionSimple() {`
and
`public Graph<TK, TVV, TopProjection<TVV, BK, BVV, EV>> topProjection() {`
`TopProjection` (we can find better names) would be a `Tuple6` with POJO
accessors as with `Vertex`, `Edge`, etc.
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