[jira] [Created] (FLINK-11877) Implement the runtime handling of TwoInputSelectable

[Shang Yuanchun (Jira)]

Haibo Sun created FLINK-11877:
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             Summary: Implement the runtime handling of TwoInputSelectable
                 Key: FLINK-11877
                 URL: https://issues.apache.org/jira/browse/FLINK-11877
             Project: Flink
          Issue Type: Sub-task
            Reporter: Haibo Sun
            Assignee: Haibo Sun


- Introduces a new class `Input` to represent the logical input of operators.
 - Introduces a new class `StreamTwoInputSelectableProcessor` to implement selectively reading.
 - Adds benchmarks for `StreamTwoInputProcessor` and `StreamTwoInputSelectableProcessor` to ensure good performance.



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