slinkydeveloper opened a new pull request #17768:
URL: https://github.com/apache/flink/pull/17768
## What is the purpose of the change
This PR clarifies the `DecodingFormat` architecture, clarifying the role of
the `physicalDataType` in `createRuntimeDecoder`, splitting the projection
ability in another interface called `ProjectableDecodingFormat`.
It also applies the change to most of the formats we support today, which
implicitly assumed (before this PR) that `DecodingFormat` included projected
fields.
## Brief change log
* Clarify `DecodingFormat` and introduce `ProjectableDecodingFormat`. For
more details, check out the javadoc included in this PR
* Introduce `ProjectedRowData` and `Projection` to simplify implementations
of connectors that needs to deal with projections
* Apply the changes to most of the formats and connectors we have. This PR
tries to address the changes to connectors and formats in a best effort manner.
## Verifying this change
The PR includes unit tests for `ProjectedRowData` and `Projection`. Changes
to `FileSystemTableSource` and to formats are already covered by existing 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)`: yes
- 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? not really, the feature
was already there but it was not properly documented
- If yes, how is the feature documented? JavaDocs
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