feat(cli): add mosaic inspector CLI (schema/meta/cat/pages)#66
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jianguotian wants to merge 3 commits into
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feat(cli): add mosaic inspector CLI (schema/meta/cat/pages)#66jianguotian wants to merge 3 commits into
jianguotian wants to merge 3 commits into
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Mosaic previously shipped no viewer tooling — inspecting a file meant writing Rust against the library API. Add a `mosaic` binary (a new `cli` workspace crate) mirroring parquet-cli: - schema: column names, Arrow types, nullability, bucket assignment - meta: row groups, rows, per-column stats (null_count/min/max) - cat: first N rows as a table, with -n and --columns projection - pages: per-column encoding (plain/const/dict/all_null) + slot size All commands support --json. The reader is driven over a new file-backed InputFile (pread). Core gains three small read-only accessors used by `pages`: BucketReader::encodings(), ColumnPageReader::encoding(), and MosaicReader::page_infos(). No format/behavior change; 199 core tests pass. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Add a core regression test for MosaicReader::page_infos asserting plain/dict/const detection on a paged-bucket file, and CLI unit tests for the fmt helpers (json escaping, value/encoding rendering, ndjson null handling, table truncation).
Drive the mosaic binary against a fixture file (via CARGO_BIN_EXE) and assert stdout for schema/meta/pages/cat, --json output, projection, row truncation and missing-file failure. No external dev-deps.
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What
Mosaic shipped no viewer tooling — inspecting a file meant writing Rust against the library API. This adds a
mosaicbinary (newcliworkspace crate) mirroring parquet-cli:-nand--columnsprojectionAll four support
--json. The reader is driven over a new file-backedInputFile(pread).Core changes (read-only, additive)
Three small accessors used by
pages:BucketReader::encodings(),ColumnPageReader::encoding(),MosaicReader::page_infos(). No format or behavior change.Verification
199 core tests pass; built schema/meta/cat/pages in both text and JSON; encodings detected correctly (const/plain/dict) on a multi-bucket file.