xuyangzhong opened a new pull request, #26907:
URL: https://github.com/apache/flink/pull/26907
## What is the purpose of the change
Delta joins might generate redundant data, while retract sinks require data
to appear in pairs as both '+' and '-' forms. So we should not convert join to
delta join when the sink is a retract sink.
## Brief change log
- *Disable duplicate changes when the sink is a retract sink*
- *Add tests*
## Verifying this change
Tests are added to verify this pr.
## 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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