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https://issues.apache.org/jira/browse/SPARK-7893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14576366#comment-14576366
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Joseph K. Bradley commented on SPARK-7893:
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[~shijinkui] Your PR should be tagged with [SPARK-7894], not this umbrella
task. Also, can you please coordinate with [~andyyehoo] about the PR?
> Complex Operators between Graphs
> --------------------------------
>
> Key: SPARK-7893
> URL: https://issues.apache.org/jira/browse/SPARK-7893
> Project: Spark
> Issue Type: Umbrella
> Components: GraphX
> Reporter: Andy Huang
> Labels: complex, graph, join, operators, union
>
> Currently there are 30+ operators in GraphX, while few of them consider
> operators between graphs. The only one is _*mask*_, which takes another graph
> as a parameter and return a new graph.
> In many complex case,such as _*streaming graph, small graph merge into huge
> graph*_, higher level operators of graphs can help users to focus and think
> in graph. Performance optimization can be done internally and be transparent
> to them.
> Complex graph operator list is
> here:[complex_graph_operations|http://techieme.in/complex-graph-operations/]
> * Union of Graphs ( G ∪ H )
> * Intersection of Graphs( G ∩ H)
> * Graph Join
> * Difference of Graphs（G – H）
> * Graph Complement
> * Line Graph ( L(G) )
> This issue will be index of all these operators
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