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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