beyond1920 opened a new pull request #18174:
URL: https://github.com/apache/flink/pull/18174
## What is the purpose of the change
In order to raise cache hit ratio, we could enforce input of lookup join to
shuffle by join key.
Introduce a hint to enable partitioned lookup join.
## Brief change log
- Update `FlinkHints` and `FlinkHintStrategies` to introduce partitioned
join hint
- Update related rule, to enforce hash distribution on input, including
`BatchPhysicalLookupJoinRule` and `StreamPhysicalLookupJoinRule`
## Verifying this change
- Plan test in batch `LookupJoinTest` and stream `LookupJoinTest`
- IT cast in batch `LookupJoinITCase` and stream `LookupJoinITCase` and
`AsyncLookupJoinITCase`
## 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, Kubernetes/Yarn, 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? (docs)
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