Au-Miner opened a new pull request, #28671:
URL: https://github.com/apache/flink/pull/28671
## What is the purpose of the change
Fix MiniBatch join output RowKind when an INSERT is folded away with a
retract in the same batch. A later UPDATE_AFTER for the same key should be
emitted as INSERT if no prior row exists downstream.
## Brief change log
- Update `InputSideHasUniqueKeyBundle#addRecord` and `foldRecord` to track
insert-and-cleared unique keys and convert the following UPDATE_AFTER to INSERT.
- Update `JoinKeyContainsUniqueKeyBundle#addRecord` and `foldRecord` with
the same correction for join keys that contain the unique key.
- Clear the inserted-and-cleared tracking state when the bundle is cleared.
## Verifying this change
Updated `BufferBundleTest` to assert that `+I` followed by `+U` keeps the
latest record as INSERT. Updated `StreamingMiniBatchJoinOperatorTest` with
MiniBatch join cases for both join-key-contains-unique-key and
input-side-has-unique-key paths, asserting that a `+I/-U/+U` sequence emits
INSERT.
## 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): yes
- 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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