SteveStevenpoor opened a new pull request, #26810:
URL: https://github.com/apache/flink/pull/26810
## What is the purpose of the change
The newly introduced `MultiJoin` operator currently does not support right
joins. Since all right joins are converted to left joins, we need to enable the
`FlinkRightToLeftJoinRule` in the MultiJoin rule set and handle left joins
using projections.
## Brief change log
- *Introduced `FlinkOrderPreservingProjection`, a wrapper around the
original projection. This class is used to define projections created by
`FlinkRightToLeftJoinRule`*
- *Patched `JoinToMultiJoinRule` to support `FlinkOrderPreservingProjection`
(i. e. right joins).*
- *Other minor adjustments related to `JoinToMultiJoinRule`.*
## Verifying this change
- *Added the following test cases to `MultiJoinTest`:*
- `testThreeWayRightInnerJoin`
- `testThreeWayRightRightJoin`
- `testThreeWayInnerRightJoin`
TODO: Semantic and restore tests will be added once `StreamExecMultiJoin` is
fixed to support right joins.
## 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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