JingsongLi opened a new pull request #8102: [FLINK-12087][table-runtime-blink] Introduce over window operators to blink batch URL: https://github.com/apache/flink/pull/8102 ## What is the purpose of the change Introduce NonBufferOverWindowOperator: Some over windows do not need to buffer data, such as rank, rows between unbounded preceding and 0, etc. We introduce NonBufferOverWindowOperator to reduce the overhead of data copy in buffer. Introduce BufferDataOverWindowOperator and OverWindowFrame: 1. Minimize duplicate computation in various OverWindowFrame implementations. 2. An OverWindowOperator can compute multiple window frames. ## Verifying this change ut ## 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? (yes) - If yes, how is the feature documented? (JavaDocs)
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