wuchong opened a new pull request #8302: [FLINK-12269][table-blink] Support Temporal Table Join in blink planner and runtime URL: https://github.com/apache/flink/pull/8302 ## What is the purpose of the change Support translate "FOR SYSTEM_TIME AS OF" query into temporal table join for both Batch and Stream. ## Brief change log - Introduce some API interface to support lookup table source - `LookupableTableSource`, `AsyncTableFunction`, `DefinedPrimaryKey`, `DefinedTableIndex`, `TableIndex`, `LookupConfig` - Support for generating optimized logical & physical plan for temporal table join for STREAM and BATCH. - Introduce temporal table join operators and async join operators for runtime. Some differences between this PR and blink branch. - Support returns multiple lines for async temporal table join - Only allow `FOR SYSTEM_TIME AS OF` on left table's proctime field, not a `PROCTIME()` builtin function. This makes syntax clean. - Lookup function support external types (i.e. `String`, `Timestamp`...). ## Verifying this change - Add several validation tests, plan tests , and integration 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)`: (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 applicable)
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