[jira] [Created] (FLINK-1758) Extend Gelly's neighborhood methods

["Vasia Kalavri (JIRA)" <ji...@apache.org>]

Vasia Kalavri created FLINK-1758:
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             Summary: Extend Gelly's neighborhood methods
                 Key: FLINK-1758
                 URL: https://issues.apache.org/jira/browse/FLINK-1758
             Project: Flink
          Issue Type: Improvement
          Components: Gelly
    Affects Versions: 0.9
            Reporter: Vasia Kalavri


Currently, the neighborhood methods only allow returning a single value per vertex. In many case, it is desirable to return several or no value per vertex. This is the case in clustering coefficient computation, vertex-centric jaccard, algorithms where a vertex computes a value per edge or when a vertex computes a value only for some of its neighbors.

This issue proposes to 
- change the current reduceOnEdges/reduceOnNeighbors methods to use combinable reduce operations where possible
- provide groupReduce-versions, which will use a Collector and allow returning none or more values per vertex.



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