gengliangwang commented on issue #28208:
URL: https://github.com/apache/spark/pull/28208#issuecomment-616959190


   I see.
   From the 
https://issues.apache.org/jira/secure/attachment/13000621/improved_version.json,
 if there are only nodes without edges, it seems providing node id is 
pointless. 
   We can build a graph if with edges.


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