Andra Lungu created FLINK-2899:
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Summary: The groupReduceOn* methods which take types as a
parameter fail with TypeErasure
Key: FLINK-2899
URL: https://issues.apache.org/jira/browse/FLINK-2899
Project: Flink
Issue Type: Bug
Components: Gelly
Affects Versions: 0.10
Reporter: Andra Lungu
I tried calling groupReduceOnEdges (EdgesFunctionWithVertexValue<K, VV, EV, T>
edgesFunction, EdgeDirection direction, TypeInformation<T> typeInfo) in order
to make the vertex-centric version of the Triangle Count library method
applicable to any kind of key and I got a TypeErasure Exception.
After doing a bit of debugging (see the hack in
https://github.com/andralungu/flink/tree/trianglecount-vertexcentric), I saw
that actually the call to
TypeExtractor.createTypeInfo(NeighborsFunctionWithVertexValue.class, .... in
ApplyNeighborCoGroupFunction does not work properly, i.e. it returns null. From
what I see, the coGroup in groupReduceOnNeighbors tries to infer a type before
"returns" is called.
I may be missing something, but that particular feature (groupReduceOn with
types) is not documented or tested so we would also need some tests for that.
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