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https://issues.apache.org/jira/browse/FLINK-2254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15545483#comment-15545483
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ASF GitHub Bot commented on FLINK-2254:
---------------------------------------

Github user greghogan commented on the issue:

    https://github.com/apache/flink/pull/2564
  
    The advantage to joining on vertex values before the grouped cross is that 
the number of projected vertices is quadratic in the vertex degree. The 
projected graphs will usually be much larger than the bipartite graph.


> Add Bipartite Graph Support for Gelly
> -------------------------------------
>
>                 Key: FLINK-2254
>                 URL: https://issues.apache.org/jira/browse/FLINK-2254
>             Project: Flink
>          Issue Type: New Feature
>          Components: Gelly
>    Affects Versions: 0.10.0
>            Reporter: Andra Lungu
>            Assignee: Ivan Mushketyk
>              Labels: requires-design-doc
>
> A bipartite graph is a graph for which the set of vertices can be divided 
> into two disjoint sets such that each edge having a source vertex in the 
> first set, will have a target vertex in the second set. We would like to 
> support efficient operations for this type of graphs along with a set of 
> metrics(http://jponnela.com/web_documents/twomode.pdf). 



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