sunjincheng121 opened a new pull request #7664: [FLINK-11449][table] Uncouple the Expression class from RexNodes. URL: https://github.com/apache/flink/pull/7664 ## What is the purpose of the change *(This pull request uncouple the Expression class from RexNodes.)* ## Brief change log - *Define a new Expression system at the API level which independent of calcite* - *Added API-level Expression to PlannerExpression conversion mechanism (visitor)* - *More other associated changes* ## Verifying this change This change is a trivial rework / code cleanup without any test coverage. ## 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) - If yes, how is the feature documented? ( not documented)
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