[jira] [Created] (CALCITE-4425) Class DefaultEdge lacks a proper toString implementation

["Liya Fan (Jira)" <ji...@apache.org>]

Liya Fan created CALCITE-4425:
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             Summary: Class DefaultEdge lacks a proper toString implementation
                 Key: CALCITE-4425
                 URL: https://issues.apache.org/jira/browse/CALCITE-4425
             Project: Calcite
          Issue Type: Improvement
          Components: core
            Reporter: Liya Fan
            Assignee: Liya Fan


It is convenient to build a graph as an object of {{DefaultDirectedGraph}}. The class has a good {{toString}} implementation, which greatly helps examining the structure of the graph. 
However, the output of the method may be confusing. In our system, the {{toString}} method produces the following result:

graph(vertices: [0, 1, 2, 3, 4, 5, 6], edges: [org.apache.calcite.util.graph.DefaultEdge@1a550334, org.apache.calcite.util.graph.DefaultEdge@891ce8a1, org.apache.calcite.util.graph.DefaultEdge@ba5c5190, org.apache.calcite.util.graph.DefaultEdge@c894f6b3, org.apache.calcite.util.graph.DefaultEdge@d72993fe, org.apache.calcite.util.graph.DefaultEdge@da030cc4, org.apache.calcite.util.graph.DefaultEdge@de17986f, org.apache.calcite.util.graph.DefaultEdge@e20be355, org.apache.calcite.util.graph.DefaultEdge@ef7b8a83, org.apache.calcite.util.graph.DefaultEdge@f2b672ef, org.apache.calcite.util.graph.DefaultEdge@f547e446])

The reason is that the default edge type is {{DefaultEdge}}, and the {{DefaultEdge}} class does not have a proper {{toString}} implementation. So we want to provide one, so that it helps investigating the internals of the graph. 



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