wuchong opened a new pull request #8678: [FLINK-12708][table] Introduce new source and sink interfaces to make Blink runner work URL: https://github.com/apache/flink/pull/8678 ## What is the purpose of the change In order to support Blink runner (especially Blink batch source/sink and lookup source), we need some new source&sink interfaces and changes about TableSchema. - `AsyncTableFunction`: used as async lookup function, to support async temporal table join (i.e. dimension table join.). - `LookupableTableSource`: The LookupableTableSource interface adds support for the table to be accessed via key column(s) in a lookup fashion in order to support temporal table join. BoundedTableSource: used for batch table source, returns a bounded DataStream, not a InputFormat, because we also want to reuse existing streaming source implementation to support bounded source, for example: bounded Kafka source. - `BoundedTableSink`: used for batch table sink, emit a bounded DataStream, not a OutputFormat. The reason is the same as above. ## Brief change log This contribution contains 4 commits: 1. Introduce `BoundedTableSource` - add `isBounded` interface to `StreamTableSource` - `BoundedTableSource` extends `StreamTableSource` and expose `getInputFormat` - removes `BatchTableSource` and `StreamTableSource` in blink planner - support it in blink and flink planner 2. Introduce `BoundedTableSink` - `BoundedTableSink` extends `StreamTableSink` expose `getInputFormat` - removes `BatchTableSink` in blink planner - support it in blink and flink planner 3. Introduce `LookupableTableSource` - removes `LookupableTableSource` and `LookupConfig` in blink planner - support it only in blink planner 4. Expose `getTableStats` in `TableSource` - support it in blink and flink planner ## Verifying this change Add some unit 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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