twalthr opened a new pull request #7967: [FLINK-11449][table] Uncouple the Expression class from RexNodes URL: https://github.com/apache/flink/pull/7967 ## What is the purpose of the change This PR aims to improves the contribution of #7664. It further minimizes the amount of changes and postpones changes in other modules. Only a small number of tests needed to be adapted. Backwards-compatibility is ensured. ## Brief change log - Rename CommonExpression to Expression - Rework the function catalog to work with the newly introduced function definitions - Rework the Scala implicits and Java expression parser to return the new expression stack - Introduce an expression bridge on the edges of the API to convert to the old expression stack as a temporary solution until the old expression stack becomes obsolete - Cleanup of main API interfaces (i.e. Table.scala and expressionDsl.scala) - Ensure that SPI classes such as FilterableTableSource and TimestampExtractor still work ## Verifying this change This change is already covered by existing tests. ## 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: 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? JavaDocs
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