Andy Huang created SPARK-7894:
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Summary: Graph Union Operator
Key: SPARK-7894
URL: https://issues.apache.org/jira/browse/SPARK-7894
Project: Spark
Issue Type: Improvement
Components: GraphX
Reporter: Andy Huang
This operator aims to union two graphs and generate a new graph directly.
Vertexes and edges which are included in either graph will be part of the new
graph.
The union of two graphs G(VG, EG) and H(VH, EH) is the union of their vertex
sets and their edge families, which means G ∪ H = (VG ∪ VH, EG ∪ EH).
The below image shows a union of graph G and graph H.
A Simple interface would be：
def union[VD: ClassTag, ED: ClassTag](other: Graph[VD, ED]): Graph[VD,
ED]
However, inevitably vertexes and edges overlapping will happen between borders
of graphs. It is necessary for interface to consider how to handle this case
for both Vertex and Edge.
For vertex, it's quite nature to have a union and remove duplicates vertexes.
But for edges, a mergeEdges function seems to be more reasonable.
def union[VD: ClassTag, ED: ClassTag](other: Graph[VD, ED], mergeEdges:
(ED, ED) => ED): Graph[VD, ED]
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