[jira] [Created] (FLINK-11896) Introduce stream physical nodes

[godfrey he (JIRA)]

godfrey he created FLINK-11896:
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             Summary: Introduce stream physical nodes
                 Key: FLINK-11896
                 URL: https://issues.apache.org/jira/browse/FLINK-11896
             Project: Flink
          Issue Type: New Feature
          Components: API / Table SQL
            Reporter: godfrey he
            Assignee: godfrey he


This issues aims to introduce flink stream physical RelNode, such as 
`StreamExecCalc`, `StreamExecExchange`, `StreamExecExpand` etc.



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