QuakeWang opened a new pull request, #386:
URL: https://github.com/apache/paimon-rust/pull/386
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### Purpose
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Linked issue: #378
Paimon Rust currently does not recognize `.mosaic` data files, so Rust
clients cannot read tables written with Mosaic by Java Paimon, PyPaimon, or
`paimon-mosaic-core`.
This PR adds the first read-only Mosaic reader foundation behind the
`mosaic` feature.
<!-- 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 optional `paimon-mosaic-core` dependency behind the `mosaic` feature.
- Add `.mosaic` reader dispatch when the feature is enabled.
- Implement a read-only Mosaic format reader using a memory-backed
`InputFile`.
- Preserve projection order, empty projection, row selection, and
unsupported-type errors.
- Add DataFusion feature passthrough and include `mosaic` in CI feature
checks.
### Tests
<!-- List unit tests or integration cases to verify this change -->
- `cargo fmt --all -- --check`
- `cargo test -p paimon --features mosaic arrow::format::mosaic`
- `cargo build --features fulltext,vortex,mosaic`
- `cargo clippy --all-targets --workspace --features
fulltext,vortex,mosaic -- -D warnings`
- `cargo test -p paimon --all-targets --features fulltext,vortex,mosaic`
### API and Format
<!-- Does this change affect API or storage format -->
Adds an optional `mosaic` Cargo feature. No writer support or storage format
change is introduced.
### Documentation
<!-- Does this change introduce a new feature or require documentation
updates -->
No user-facing documentation is added in this PR. Predicate pushdown and
async random-access reading are left as follow-up work.
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