QuakeWang opened a new pull request, #318:
URL: https://github.com/apache/paimon-rust/pull/318
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### Purpose
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Linked issue: close #255
This PR supports `changelog-producer=input` for primary-key table writes in
the scoped Rust write path.
The implementation double-writes primary-key input rows into changelog files
while keeping normal table data files deduplicated, then commits changelog
files through separate changelog manifest metadata.
<!-- What is the purpose of the change -->
### Brief change log
<!-- Please describe the changes made in this pull request and explain how
they address the issue -->
- Add typed parsing for `changelog-producer` and changelog file options in
`CoreOptions`.
- Add `PreparedFiles` and propagate changelog files separately from normal
data files.
- Teach `KeyValueFileWriter` to write input changelog files from the full
sorted input rows, while normal data files still use merge-engine selected rows.
- Compute changelog `DataFileMeta` from changelog rows, including row
count, key stats, sequence range, and retract row count.
- Add `CommitMessage::new_changelog_files` and commit changelog entries
into a separate changelog manifest list.
- Populate snapshot `changelogManifestList` and `changelogRecordCount`.
- Reject unsupported combinations early, including non-PK tables,
non-deduplicate merge engines, cross-partition dynamic bucket, `bucket=-2`,
`rowkind.field`, unsupported changelog producers, and overwrite with changelog
files.
- Preserve existing normal data manifest, index manifest, and table record
count behavior.
### Tests
<!-- List unit tests or integration cases to verify this change -->
- `cargo fmt --all -- --check`
- `cargo clippy -p paimon --all-targets -- -D warnings`
- `cargo test -p paimon changelog`
- `cargo test -p paimon`
### API and Format
<!-- Does this change affect API or storage format -->
### Documentation
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updates -->
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