JingsongLi opened a new pull request #9876: [FLINK-14134][table] Introduce LimitableTableSource for optimizing limit URL: https://github.com/apache/flink/pull/9876 ## What is the purpose of the change SQL: select *from t1 limit 1 Now source will scan full table, if we can introduce LimitableTableSource, let source know the limit line, source can just read one row is OK. Adds support for limiting push-down to a TableSource. A TableSource extending this interface is able to limit the number of records. ## Verifying this change LimitTest for plan test. LimitITCase for it case. ## 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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