refactor!: compose exact current-format readers - #8024
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…mat-identity # Conflicts: # rust/lance-file/src/reader.rs # rust/lance/src/dataset/transaction.rs
… xuanwo/exact-version-stack-05-file-runtime
…rsion-stack-02-fixtures
…ct-version-stack-03-v1
…sion-stack-04-encoding-mechanisms
… xuanwo/exact-version-stack-05-file-runtime
…/exact-version-stack-06-writers
…t-version-stack-07-readers
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July 31, 2026 18:22
…stack-07-readers # Conflicts: # rust/lance-encoding/benches/common/mod.rs # rust/lance-encoding/src/array_encoding/physical/bitpack.rs # rust/lance-encoding/src/array_encoding/physical/fixed_size_binary.rs # rust/lance-encoding/src/array_encoding/strategy.rs # rust/lance-encoding/src/compression.rs # rust/lance-encoding/src/encoder.rs # rust/lance-encoding/src/encodings/logical/primitive/sparse/writer.rs # rust/lance-encoding/src/lib.rs # rust/lance-encoding/src/testing.rs # rust/lance-file/src/lib.rs # rust/lance-file/src/reader.rs # rust/lance-file/src/version.rs # rust/lance-file/src/versions/mod.rs # rust/lance-file/src/versions/v1/encoding/plain.rs # rust/lance-file/src/versions/v1/mod.rs # rust/lance-file/src/versions/v2_0/mod.rs # rust/lance-file/src/versions/v2_0/writer.rs # rust/lance-file/src/versions/v2_1/compression.rs # rust/lance-file/src/versions/v2_1/mod.rs # rust/lance-file/src/versions/v2_2/compression.rs # rust/lance-file/src/versions/v2_2/mod.rs # rust/lance-file/src/versions/v2_3/compression.rs # rust/lance-file/src/versions/v2_3/mod.rs # rust/lance-file/src/writer.rs # rust/lance-file/src/writer/structural.rs # rust/lance-file/src/writer_tests.rs # rust/lance-file/test_data/exact_versions/README.md # rust/lance-index/src/scalar/lance_format.rs # rust/lance-index/src/vector/utils.rs # rust/lance-table/src/format.rs # rust/lance-table/src/format/manifest.rs # rust/lance/src/dataset.rs # rust/lance/src/dataset/builder.rs # rust/lance/src/dataset/fragment.rs # rust/lance/src/index/vector/ivf.rs # rust/lance/src/index/vector/ivf/io.rs # rust/lance/src/index/vector/pq.rs
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The exact-version reader roots address a real file-format boundary: V2.0–V2.3 now validate their own footer identity, encoding grammar, alignment, projection shape, and metadata capabilities while shared I/O and decode machinery stays centralized. The stable wire contracts remain covered through exact-version fixtures, and I found no durable-format or correctness blocker.
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Part 7/12 of #7877. Depends on #8023.
This is an independently reviewable step toward the final layout demonstrated in #7979.
This PR gives V2.0, V2.1, V2.2, and V2.3 explicit reader composition alongside V1. The root reader keeps shared runtime machinery and type-erased forwarding, but exact version modules own construction, decoder selection, and supported capabilities.
The large shared reader implementation is reduced to mechanisms that are actually common. Version-sensitive choices no longer depend on ordering comparisons or scattered conditions, and the reader still parses persisted identity once at the boundary.
Validation:
cargo test -p lance-filecargo clippy --all --tests --benches -- -D warningsuv run make buildinpython/cargo check --manifest-path java/lance-jni/Cargo.toml