[jira] [Updated] (FLINK-2899) The groupReduceOn* methods which take types as a parameter fail with TypeErasure

["Andra Lungu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-2899?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andra Lungu updated FLINK-2899:
-------------------------------
    Assignee:     (was: Andra Lungu)

> 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: 0.10.0
>            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. 



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)