[jira] [Created] (FLINK-12967) Change the input selection switching in StreamTwoInputSelectableProcessor#checkFinished to invoking the nextSelection method of the stream operator

[Shang Yuanchun (Jira)]

Haibo Sun created FLINK-12967:
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             Summary: Change the input selection switching in StreamTwoInputSelectableProcessor#checkFinished to invoking the nextSelection method of the stream operator
                 Key: FLINK-12967
                 URL: https://issues.apache.org/jira/browse/FLINK-12967
             Project: Flink
          Issue Type: Sub-task
            Reporter: Haibo Sun
            Assignee: Haibo Sun


The runtime (`StreamTwoInputSelectableProcessor#checkFinished()`) switches the input selection when one input is finished, because `BoundedxInput.endInput()` was not supported before the PR#8731 (https://github.com/apache/flink/pull/8731) is merged. Now we should change the logic of `StreamTwoInputSelectableProcessor#checkFinished()` to invoke `InputSelectable#nextSelection()`, and the input selection should been switched in `endInput()` by the operator.



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