SteveStevenpoor opened a new pull request, #27166:
URL: https://github.com/apache/flink/pull/27166
## What is the purpose of the change
This pull request fixes a bug in how common join keys are detected.
Previously, the strategy collected all join keys from equality conditions
and intersected them with the original join keys. However, in some cases, not
all of these keys should be used — only the truly common keys (the key itself
and all equivalent keys) are required.
## Brief change log
- **Added** `conditionsToFieldsMap` into `MultiJoin`
- **Updated** a strategy of detecting common join keys
## Verifying this change
This change added tests and can be verified as follows:
- **Added** `testFourWayJoinNoCommonJoinKeyRelPlan2` into
`MultiJoinTest`, which verifies the change
## 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? not applicable
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