Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/3788
@fanzhidongyzby that sounds good except I would leave the `EmptyGraph` as
it is. In addition we'll want to add the new generators as driver inputs in
`flink-gelly-examples`, add to the list of inputs in `Runner`, and add a test
each to `EdgeListITCase` (run the test to compute the checksum to create the
test string).
Also, on the graph name, without a reference to the literature, perhaps
this could be something invoking the idea that vertices are connected by
length-1 paths to "far" vertices, by length-2 paths to "near" vertices, by
length-3 paths to "far" vertices, etc. Something like `EchoGraph`.
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