TsReaper opened a new pull request #13837:
URL: https://github.com/apache/flink/pull/13837
## What is the purpose of the change
`JoinDeriveNullFilterRule` will filter out null join keys to prevent data
skew for joins. Currently this rule is only applied before join reorder. After
join reorder the join keys for some inputs might change and we need to apply
this rule again.
This PR applies the rule again after join reorder.
## Brief change log
- Apply `JoinDeriveNullFilterRule` after join reorder
## Verifying this change
This change added tests and can be verified by running the added 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, Kubernetes/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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