godfrey he created FLINK-20668:
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Summary: Introduce translateToExecNode method for FlinkPhysicalRel
Key: FLINK-20668
URL: https://issues.apache.org/jira/browse/FLINK-20668
Project: Flink
Issue Type: Sub-task
Components: Table SQL / Planner
Reporter: godfrey he
Currently, we introduce ExecGraphGenerator to translate a graph of
FlinkPhysicalRel to a ExecNode graph. While as more and more ExecNode
supported, ExecGraphGenerator is hard to maintain. So we introduce
FlinkPhysicalRel#translateToExecNode to create specific ExecNode in each
physical RelNode, and ExecGraphGenerator is used to build the whole graph based
on the translated ExecNode, including connecting the input/output nodes,
handling the rel visitor, handle some special nodes (such as, Exchange), etc.
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