hequn8128 opened a new pull request #8493: [FLINK-12562][table] Improve code in ExpandColumnFunctionsRule URL: https://github.com/apache/flink/pull/8493 ## What is the purpose of the change This pull requests resolve IntelliJ warnings in `ExpandColumnFunctionsRule`. Also, change TableException to ValidationException for the validation as `ValidationException` is used to indicate something wrong from users while `TableException` means unsupported stuff or some weird state for Flink. ## Brief change log - Change TableException to ValidationException for validation. - Fix code warnings. - Adjust tests. ## Verifying this change This change is already covered by existing tests, such as `ColumnFunctionsValidationTest`. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (no) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no) - The serializers: (no) - The runtime per-record code paths (performance sensitive): (no) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no) - The S3 file system connector: (no) ## Documentation - Does this pull request introduce a new feature? (no)
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