hequn8128 opened a new pull request #8087: [FLINK-12029][table] Add column operations for TableApi URL: https://github.com/apache/flink/pull/8087 ## What is the purpose of the change This pull request adds column operations for TableApi. Column oprations can be used to select or deselect columns. More details can be found in the google design doc. ## Brief change log - Add different columns operations for TableApi. - Add Tests - Add document ## Verifying this change This change added tests and can be verified as follows: - Added integration test `testColumnOperations` in `CalcITCase`. - Add `ColumnsOperationTest` to test column operations in different table operations. - Add validation tests `ColumnsOperationValidationTest` to test exceptions. ## 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)`: (yes) - The serializers: (yes / no / don't know) - 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? (yes) - If yes, how is the feature documented? (docs)
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