sunhaibotb opened a new pull request #8864: [FLINK-12967][runtime] Change the processing that the input reaches the end to comply with the InputSelectable contract URL: https://github.com/apache/flink/pull/8864 ## What is the purpose of the change This pull request changes the processing that the input reaches the end to comply with the following `InputSelectable` contract. - When the input being read reaches the end, the runtime must call `nextSelection()` to determine the next input to be read. ## Brief change log - Uses invoking `InputSelectable#nextSelection()` to replace the assignment on the input selection in `StreamTwoInputSelectableProcessor#checkFinished()` . The input selection should been switched in `endInput()` by the operator. ## Verifying this change This change is already covered by existing tests, such as `StreamTaskSelectiveReadingTest`, `StreamTaskSelectiveReadingITCase`. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (yes / **no**) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**) - The serializers: (yes / **no** / don't know) - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know) - The S3 file system connector: (yes / **no** / don't know) ## Documentation - Does this pull request introduce a new feature? (yes / **no**) - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
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