xuyangzhong opened a new pull request, #23620:
URL: https://github.com/apache/flink/pull/23620
## What is the purpose of the change
This pr try to fix that join hints should also be resolved and work when
defined in subquery.
## Brief change log
- *Modify the code in SqlToRelConverter to progagate the join hint when
converting*
- *Add an abstract shuttle to resolve join hint both in normal nodes and
sub-querys.*
- *Added a brief description of handling join hints in JoinStrategy*
- *Correct the tests*
## Verifying this change
This change is already covered by existing tests. There is also some extra
tests added to verify it.
## 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?no
- If yes, how is the feature documented?
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