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From "Vasia Kalavri (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-2905) Add intersect method to Graph class
Date Tue, 27 Oct 2015 15:28:27 GMT

    [ https://issues.apache.org/jira/browse/FLINK-2905?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14976558#comment-14976558

Vasia Kalavri commented on FLINK-2905:

This is still not clear to me.
Correct me if I'm wrong, but the intersection of 2 graphs is a new graph, which maintains
one edge for each edge that is common in the 2 input graphs, i.e. intersection should not
have duplicate edges. The example with the transportation networks should work with either
a union + aggregation or a join the edge sets on <src, trg>. A solution would be to
have the {{intersect}} method look at the IDs only and receive a UDF which can be applied
on the common edge values. This way, the output graph won't have any duplicates and you can
do whatever you want with the common edges values. Does this make sense?

> Add intersect method to Graph class
> -----------------------------------
>                 Key: FLINK-2905
>                 URL: https://issues.apache.org/jira/browse/FLINK-2905
>             Project: Flink
>          Issue Type: New Feature
>          Components: Gelly
>    Affects Versions: 0.10
>            Reporter: Martin Junghanns
>            Assignee: Martin Junghanns
>            Priority: Minor
> Currently, the Gelly Graph supports the set operations {{Graph.union(otherGraph)}} and
{{Graph.difference(otherGraph)}}. It would be nice to have a {{Graph.intersect(otherGraph)}}
method, where the resulting graph contains all vertices and edges contained in both input

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