afedulov opened a new pull request #19286:
URL: https://github.com/apache/flink/pull/19286
## What is the purpose of the change
FLINK-24703 added support for projection pushdown in CsvFileFormatFactory.
This PR adds the same functionality for non-file-based connectors that use
CsvFormatFactory and on Ser/DeSerialization schemas.
## Brief change log
- Switches CsvFormatFactory to using ProjectableDecodingFormat instead of
simple DecodingFormat
- A distinction is made between the physical(read from file) RowType and
the returned projected RowData type
- CsvRowDataDeserializationSchema is initialized with both physical and
projected RowTypes and filters out unused fields from the returned results
## Verifying this change
This change added tests and can be verified as follows:
- Adds and a unit test that verifies that the fields not used in the
TableAPI are filtered out
## Does this pull request potentially affect one of the following parts:
- Dependencies (does it add or upgrade a dependency): (yes / *no*)
- The public API, i.e., is any changed class annotated with
`@Public(Evolving)`: (yes / *no*)
- The serializers: (*yes* / no / don't know)
- The runtime per-record code paths (performance sensitive): (yes / *no* /
don't know)
- Anything that affects deployment or recovery: JobManager (and its
components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / *no* / don't
know)
- The S3 file system connector: (yes / *no* / don't know)
## Documentation
- Does this pull request introduce a new feature? (*yes* / no)
- If yes, how is the feature documented? (*not applicable - internal
optimization* / docs / JavaDocs / not documented)
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