Liya Fan created CALCITE-3976:
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Summary: Generify the DefaultEdge class
Key: CALCITE-3976
URL: https://issues.apache.org/jira/browse/CALCITE-3976
Project: Calcite
Issue Type: Improvement
Components: core
Reporter: Liya Fan
Assignee: Liya Fan
Currently, the {{source}} and {{target}} fields of class {{DefaultEdge}} is
{{Object}}. This makes it necessary for some casts in the code base. In
addition, it does not enforce the assertion that in a graph, the vertices have
the same type as sources and targes in the edges.
To solve the problem, we generify the DefaultEdge class with the type of the
source/target vertices.
The benefits of generfication includes type safety: the above assertion can be
enforced by the generified class. It also gives the compiler an opportunity to
detect type related problems at compilation time. Without generification, some
problems can only be detected at runtime, when a ClassCastException is thrown.
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