qingwei91 opened a new pull request, #20138:
URL: https://github.com/apache/flink/pull/20138
## What is the purpose of the change
Implement Filter Pushdown in JDBC Connector Source, this is an optimization
that will avoid scanning the whole table into Flink when we only need a subset
of the table.
## Brief change log
* Implement a SQL Visitor that converts Flink SQL AST to JDBC SQL String
* Implement FilterPushdown in JDBCDynamicSource using the Visitor
* Add tests for both Visitor and JDBCDynamicSource
## Verifying this change
This change added tests and can be verified as follows:
* Added Integrated Test in JdbcDynamicTableSourceITCase to make sure there
is no regression on SQL Filtering
* Added JdbcFilterPushdownVisitorTest to verify we are generating SQL
correctly
## 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, Kubernetes/Yarn, 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 documented)
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