hequn8128 opened a new pull request #7976: [FLINK-11908] Port window classes into flink-api-java URL: https://github.com/apache/flink/pull/7976 ## What is the purpose of the change This pull request ports window classes into flink-api-java module. ## Brief change log - Convert Tumble/Slide/Session/Over related classes to interface and rename the original class from XXX to XXXImpl. For example, add a TumbleWithSize interface and rename the original TumbleWithSize to TumbleWithSizeImpl. We can't port TumbleWithSize directly into the api-java module because ExpressionParser is used in it. - Deprecate `def window(window: Window): WindowedTable` and add `def window(window: GroupWindow): GroupWindowedTable` - Deprecate class WindowedTable and add GroupWindowedTable - Add test case, such as WindowValidationTest, to test failures for the creation of window. ## Verifying this change This change is already covered by existing Window IT/UT test cases. Furthermore, WindowValidationTest has been add to test failures for the creation of window. ## 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)
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