Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/2842
I count nine uses of `TypeExtractor.createTypeInfo` in `Graph` and one each
in `ScatterGatherIteration`, `VertexCentricIteration`, and
`GatherSumApplyIteration`. The latter still need to allow for the UDF to
implement `ResultTypeQueryable`.
For example, won't `ScatterGatherIteration` type extraction currently fail
on a `ScatterFunction` where the `Message` type is based on `K`, 'VV`, or `EV`?
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