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https://issues.apache.org/jira/browse/FLINK-2899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Flink Jira Bot updated FLINK-2899:
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Labels: auto-deprioritized-major auto-deprioritized-minor (was:
auto-deprioritized-major stale-minor)
Priority: Not a Priority (was: Minor)
This issue was labeled "stale-minor" 7 days ago and has not received any
updates so it is being deprioritized. If this ticket is actually Minor, please
raise the priority and ask a committer to assign you the issue or revive the
public discussion.
> 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: Library / Graph Processing (Gelly)
> Affects Versions: 0.10.0
> Reporter: Andra Lungu
> Priority: Not a Priority
> Labels: auto-deprioritized-major, auto-deprioritized-minor
>
> 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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