godfrey he created FLINK-21041:
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Summary: Introduce ExecNodeGraph to wrap the ExecNode topology
Key: FLINK-21041
URL: https://issues.apache.org/jira/browse/FLINK-21041
Project: Flink
Issue Type: Sub-task
Components: Table SQL / Planner
Reporter: godfrey he
Fix For: 1.13.0
Currently, we use {{List<ExecNode<?>}} to represent the {{ExecNode}} topology,
as we will introduce more features (such as serialize/deserialize
{{ExecNode}}s), It's better we can introduce an unified class to represent the
topology.
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