QuakeWang opened a new pull request, #764:
URL: https://github.com/apache/paimon-rust/pull/764
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### Purpose
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Closes: #34
Bitmap and Bloom implementations already existed, but callers still had to
match identifiers and construct concrete readers and writers directly. This
leaked implementation details into future scan and writer integrations.
This change adds crate-private contracts and built-in dispatch so
outer-format index payloads can be composed without depending on concrete index
implementations.
<!-- What is the purpose of the change -->
### Brief change log
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they address the issue -->
- Add a common `FileIndexWriter` contract and built-in Bitmap/Bloom
factory.
- Build per-column readers from outer-format metadata and schema.
- Handle nested map columns, empty indexes, type/options validation, and
unknown identifiers.
- Add component E2E coverage for multiple columns and indexes.
### Tests
<!-- List unit tests or integration cases to verify this change -->
- `cargo fmt --all -- --check`
- `cargo test --locked -p paimon --all-targets --features fulltext,vortex`
### API and Format
<!-- Does this change affect API or storage format -->
### Documentation
<!-- Does this change introduce a new feature or require documentation
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