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      "message": "[cli] Add mosaic command-line tool (#66)\n\n* feat(cli): add mosaic inspector CLI (schema/meta/cat/pages)\n\nMosaic previously shipped no viewer tooling — inspecting a file meant\nwriting Rust against the library API. Add a `mosaic` binary (a new `cli`\nworkspace crate) mirroring parquet-cli:\n\n- schema: column names, Arrow types, nullability, bucket assignment\n- meta:   row groups, rows, per-column stats (null_count/min/max)\n- cat:    first N rows as a table, with -n and --columns projection\n- pages:  per-column encoding (plain/const/dict/all_null) + slot size\n\nAll commands support --json. The reader is driven over a new file-backed\nInputFile (pread). Core gains three small read-only accessors used by\n`pages`: BucketReader::encodings(), ColumnPageReader::encoding(), and\nMosaicReader::page_infos(). No format/behavior change; 199 core tests pass.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* test: cover page_infos encodings and CLI formatters\n\nAdd a core regression test for MosaicReader::page_infos asserting\nplain/dict/const detection on a paged-bucket file, and CLI unit tests\nfor the fmt helpers (json escaping, value/encoding rendering, ndjson\nnull handling, table truncation).\n\n* test: add zero-dep end-to-end tests for mosaic CLI\n\nDrive the mosaic binary against a fixture file (via CARGO_BIN_EXE) and\nassert stdout for schema/meta/pages/cat, --json output, projection,\nrow truncation and missing-file failure. No external dev-deps.\n\n* docs: add CLI page + parquet-cli comparison\n\nAdds docs/cli.html documenting the mosaic inspector (schema/meta/pages/cat,\ntext + JSON) with a parquet-cli command mapping and design-difference table,\naddressing the review asks on #66. Adds CLI to the nav across doc pages.\n\n* docs: expand CLI page with meta example and parquet-cli design table\n\n* feat(cli): add head, footer, column-size, dictionary commands\n\nAlign the viewer command set with parquet-cli/arrow-rs: head (alias of\ncat), footer (magic/version/buckets/compression), column-size (on-disk\nbytes per column), dictionary (dump dict-encoded entries). Core gains\ncompression()/dict_values()/dictionary() read-only accessors. e2e tests\ncover the new commands.\n\n* feat(cli): add buckets command for mosaic bucket layout\n\nMosaic\u0027s column-bucket grouping has no parquet equivalent. Add a\nbuckets command printing, per row group, each bucket\u0027s kind\n(empty/monolithic/paged), on-disk size and member columns. Core gains\nMosaicReader::bucket_infos(). e2e covered.\n\n* feat(cli): dictionary takes -c/--column to match parquet-cli\n\nAlign dictionary column selection with parquet-cli\u0027s -c flag instead of\na positional argument; update e2e.\n\n* feat(cli): add --json to dictionary\n\nCompletes JSON output across all 9 commands; dict columns emit an array,\nnon-dict row groups emit null. e2e extended.\n\n* docs: document all 9 commands; remove parquet comparison\n\nExpand docs/cli.html and cli/README.md to cover every command\n(schema/meta/footer/buckets/pages/dictionary/column-size/cat/head) with\nusage and example output. Drop all comparison content per maintainer\npreference.\n\n* test: drop trivial encoding_names unit; assert footer/buckets --json\n\nRemove the near-trivial encoding_names mapping test; extend footer and\nbuckets e2e to cover their --json output, improving CLI feature coverage.\n\n* chore(cli): drop redundant gen.rs example\n\nThe e2e tests carry their own fixture writer; the standalone gen.rs\nexample duplicated it and was unreferenced.\n\n* fix(cli): column-size counts monolithic buckets; bare Date32 JSON\n\ncolumn-size summed PageInfo.slot_size, which is 0 for monolithic buckets\n(the default for small files), so every column reported 0 B. Attribute each\nbucket\u0027s on-disk size to its columns via bucket_infos instead; add a\ndefault-threshold e2e so monolithic files are covered. Also emit Date32 as a\nbare epoch-day integer in cat --json for consistency with other numerics.\n\n* feat(cli): show compression ratio in column-size and buckets\n\nBucketInfo now carries uncompressed size (exact for monolithic, unknown for\npaged). column-size prints a total with uncompressed bytes + ratio; buckets\nshows per-bucket ratio when known. Tests + docs updated.\n\n* feat(cli): add count, cat --all and cat --where row filter\n\ncount prints total rows; --all drops the -n cap; --where applies one\ncolumn/op/value condition (\u003d,!\u003d,\u003e,\u003e\u003d,\u003c,\u003c\u003d), numeric or string. Tests + docs.\n\n* feat(cli): add convert (CSV import) and stats-based where pushdown\n\nconvert imports a CSV into a new Mosaic file (schema inferred, --stats picks\nmin/max columns). cat --where now skips row groups whose min/max provably\nexclude the predicate, conservative (any missing stat keeps the group).\nTests + docs.\n\n* feat(cli): convert also imports JSON lines\n\nconvert dispatches on extension: .json/.ndjson/.jsonl read one object per line\nvia arrow-json (CSV path unchanged). Test + docs.\n\n* docs(cli): restructure README into Install/Inspect/Query/Convert sections\n\n* fix(cli): harden page_infos bounds, where ordering, NaN JSON, convert atomicity\n\n- page_infos validates paged slot sizes sum to total (rejects forged sizes\n  that could drive a ~4GiB read, matching the projected reader)\n- cat --where: ordering ops on a non-numeric column/value error instead of\n  silently dropping all rows\n- cat --json: NaN/Infinity emit null (was invalid JSON)\n- convert writes a temp file and renames on success (no truncated output)\n\n* fix(cli): column-size omits total ratio when uncompressed size is partial\n\nPaged buckets don\u0027t record uncompressed size, so summing across a mixed file\ngave a misleading total ratio (e.g. 0.01x). Only report the total ratio when\nevery non-empty bucket\u0027s uncompressed size is known.\n\n* fix(cli): address review — valid JSON, type-driven where, exact paged column-size\n\n- cat --json renders via Arrow JSON writer: all reader types valid, NaN-\u003enull\n- where: numeric cols compare numerically, others exact string; ordering numeric-only\n- column-size: paged uses exact slot sizes, monolithic multi-col marked (approx)\n- README: scope --json to inspection/query commands (convert writes a file)\n\n* refactor(cli): merge head into cat alias, fix Date pushdown, harden edges\n\n- Cat/Head: single variant with visible_alias\u003dhead (no duplicated fields)\n- stats_exclude reads Value numerically (to_f64) — Date/Time pushdown no longer\n  silently disabled by the (epoch-day) string suffix\n- pretty_table/ndjson guard empty input; cell shows \u003cType\u003e not ? for unhandled\n- page_infos slot-sum uses checked_add; docs --json scope fixed\n\n* fix(cli): exact integer where/pushdown, ndjson returns Result\n\n- where and stats_exclude compare integers in i128 (full i64 range exact);\n  large ids (Snowflake) no longer mis-skip or mis-match via lossy f64\n- ndjson returns io::Result instead of .expect, keeping the CLI error contract\n\n* docs(cli): note where compares numbers exactly (\u003d0.3 matches only stored 0.3)\n\n* chore(cli): use arrow umbrella crate instead of 5 split crates\n\nReplace arrow-array/schema/select/csv/json with arrow \u003d {features\u003dcsv,json};\none version to bump, paths via arrow::{array,datatypes,error,compute,csv,json}.\n\n* fix(cli): convert pluralizes row/column count (no \u00271 rows\u0027)\n\n* fix(cli): --where works on a column excluded by -c\n\nRead the filter column even when projected out, then drop it before printing,\nso cat -c id,name --where score\u003e440 filters instead of erroring.\n\n* review: cat/head split, convert --overwrite, pages/-c, typed inspect API, CI\n\n- head split from cat: cat prints all rows, head defaults 10 (shared handler)\n- convert refuses existing output unless --overwrite (no silent clobber)\n- pages/column-size take -c to inspect chosen columns\n- core inspect API: Encoding/BucketKind enums, #[non_exhaustive] structs\n- fmt + clippy clean so CI check job passes; docs synced\n\n* review: typed/bool where filter, reader refactor, bench dedup\n\n- where: compare typed Arrow values; bool columns require true/false; tighten numeric guards\n- reader: rework column/page info path\n- bench_wide_table: share bench_common.hpp, drop duplicated generators\n- tests/docs: cover bool where + new cases\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* perf(cli): column-size reads slot dir only, no slot decode\n\nAdd Reader::slot_sizes (directory-only paged slot sizes); column-size used\npage_infos which decompressed/parsed every slot just for encodings it discards.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* fix(core): column-size/pages handle ARRAY paged buckets\n\nAfter the ARRAY merge, paged directories carry a child header plus one slot\nper physical column; page_infos/slot_sizes parsed it as N logical u32s and\nmis-read or failed validation. Add paged_dir() to skip the header and read\nphysical slots; attribute child bytes to the parent. Test over a List column.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* style: apply rustfmt to where filter, inspect, tests\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* fix(cli): --where compares Float32 at f32 precision\n\nA Float32 cell widened to f64 never equals the f64-parsed RHS (stored 0.1f32\n!\u003d 0.1f64), so price\u003d0.1 dropped every row. Parse the RHS as f32 for Float32\ncolumns. Test added.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* fix(cli): where pushdown rounds Float32 RHS to f32 like the row filter\n\nAfter the f32 where fix, stats_exclude still parsed the RHS as f64 while\napply_where used f32, so a Float32 group with a matching row could be pruned\n(\u0027no rows\u0027). Round the RHS to f32 when stats are Float; test now uses stats.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* fix(cli): strip control chars from table cells (no ANSI injection)\n\ncat/head printed Utf8 cells verbatim, so a crafted file\u0027s ANSI escapes\nmanipulated the inspector terminal (CWE-150); the JSON path was already\nescaped. Replace control chars with U+FFFD; test added.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* fix(cli): strip control chars from all file-derived text output\n\nA crafted file\u0027s strings reach the terminal raw, so attacker-controlled\nbytes could inject ANSI escapes. Add fmt::safe() and route every text-mode\nsink through it: stats min/max (render_value), table cells, dict entries,\nand schema column names in inspect/meta/pages/column-size/buckets/headers.\nJSON output stays escaped by json_str/the writer.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* fix(core): cap zstd pre-alloc at 512 MiB absolute (not just ratio)\n\nThe 65536x ratio let a ~1 MiB compressed block legally request 64 GiB\nbefore reading a byte. Clamp the cap to a 512 MiB absolute ceiling so a\ntiny file can\u0027t drive a giant pre-alloc; a real slot/page is far below it.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* fix(cli): --where f32 RHS reuses parsed value, drops dead NaN branch\n\nThe Float32 path re-parsed the RHS and unwrap_or(NaN) was unreachable (any\nf64-parseable literal also f32-parses, saturating to inf). Reuse the\nalready-parsed rhs rounded to f32 width; symmetric with stats_exclude.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* fix(cli): emit machine-parseable stats in --json; propagate count errors\n\nmeta/dictionary --json wrapped render_value(), leaking human suffixes like\n\"18627 (epoch-day)\" / \"5 (ms)\" into JSON — unparseable downstream. Add\nrender_json() that strips units (nanos collapse to a count); text keeps them.\nAlso sum row-group counts via ? so meta/count fail loud instead of unwrap_or(0)\nsilently undercounting a corrupt file.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* perf(cli): pretty_table downcasts each column once, not per cell\n\ncell() re-ran the data_type match + downcast for every (row,col); cat\nrenders all rows by default. Replace with col_formatter() built once per\ncolumn per batch, mirroring apply_where. Same output, no per-cell downcast.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* perf(core): paged_dir returns children so slot_sizes drops recompute\n\nslot_sizes re-ran expand_col_types just to map ARRAY child slots to parents\nright after paged_dir already computed it. Return children from paged_dir and\nreuse them — one expand per paged bucket, one fewer reach into bucket_writer.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* refactor: share FileSink output sink between CLI and tests\n\nFileOut was implemented twice (convert path + e2e tests) with subtly\ndifferent pos accounting. Move it to core::writer as FileSink (where the\nOutputFile trait lives); both reuse it, so tests now cover the real sink.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* refactor(cli): typed Op enum for --where, not magic \u0026str\n\nThe comparison operator was a stringly-typed \u0026\u0027static str threaded through\ncmp_op/excl/apply_where with _ \u003d\u003e false fallthrough. Replace with an Op enum;\ncmp_op/excl are now exhaustive, so a new operator must be handled everywhere.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* perf(cli): cat --json streams row groups instead of buffering all\n\ncat collected every row group\u0027s batch before printing; cat --json on a big\nfile held the whole result in memory. Stream each group out as ndjson; the\ntable path still buffers (column widths need all rows first).\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* refactor(cli): split row filtering out of fmt into filter module\n\nfmt.rs mixed presentation (render/table/json) with query filtering (Where,\nOp, apply_where, stats_exclude). Move the filter half to filter.rs verbatim;\npure relocation, no behavior change.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* refactor(cli): model command JSON with serde, drop hand-rolled json_str\n\nEight commands hand-assembled JSON via format!/json_str; a missed comma or\nescape was silent. Add jsonout models (#[derive(Serialize)]) and serialize\neach; output byte-identical (verified across all 8). serde was already in the\ntree via arrow. Removes json_str.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* docs(cli): safe() comment points to serde, not removed json_str\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* refactor(cli): unify column-select check, dedup convert opens, align name helpers\n\n- arch-2: pages/column_size repeated the -c membership check three ways; one\n  selected() helper now backs all of them.\n- arch-3: bucket_kind returns String like encoding_name, so callers handle one type.\n- arch-4: convert\u0027s two passes share one open() closure instead of four File::open.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* style: rustfmt the cli/core refactors (CI fmt gate)\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* fix: address PR 66 review feedback\n\n* fix(cli): unique convert temp file + reject nested dict columns\n\nconvert: use a process-unique sibling temp name instead of fixed\nout.mosaic.tmp, so a stray user file is never clobbered/removed.\ndictionary: reject List/LargeList/Map columns (first physical slot is\nthe length column) instead of printing misleading junk, matching\nparquet-cli\u0027s primitive-leaf rule.\n\nCo-Authored-By: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\n\n* fix(cli): keep cat unbounded by default\n\n* fix: harden paged dir and file sink writes\n\n* fix(cli): drop redundant cat all flag\n\n---------\n\nCo-authored-by: mingfeng \u003ctjg281622@antgroup.com\u003e\nCo-authored-by: Claude Opus 4.8 \u003cnoreply@anthropic.com\u003e\nCo-authored-by: jianguotian \u003cjianguotian2010@gmail.com\u003e\nCo-authored-by: JingsongLi \u003cjingsonglee0@gmail.com\u003e"
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      "message": "ci: check Rust dependency licenses (#31)\n\nSigned-off-by: QuakeWang \u003cwangfuzheng0814@foxmail.com\u003e"
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    {
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        "time": "Fri May 22 10:16:06 2026 +0800"
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      "message": "ci: trigger CI for release branch pushes and PRs (#30)\n\nSigned-off-by: QuakeWang \u003cwangfuzheng0814@foxmail.com\u003e"
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    {
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        "time": "Thu May 21 15:24:11 2026 +0800"
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        "time": "Thu May 21 15:24:11 2026 +0800"
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      "message": "fix: preserve Python projection schema for empty reads (#28)"
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      "message": "Add release tooling scripts and unify CI infrastructure (#27)\n\n- Flatten tools/releasing/ into tools/ for simpler layout\n- Add tools/validate_asf_yaml.py for .asf.yaml schema validation\n- Add tools/dependencies.py for cargo-deny license check and DEPENDENCIES.rust.tsv generation\n- Upgrade GitHub Actions versions to latest (checkout@v6, cache@v5, artifact@v5)\n- Add .asf.yaml validation step to CI check job\n- Update docs/creating-a-release.html with new script paths and dependency license step"
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        "email": "jingsonglee0@gmail.com",
        "time": "Wed May 20 20:38:39 2026 +0800"
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      "message": "Maven modified to org.apache.paimon and mosaic\n"
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      },
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        "email": "jingsonglee0@gmail.com",
        "time": "Wed May 20 20:27:50 2026 +0800"
      },
      "message": "Remove push build to public_snapshot\n"
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    {
      "commit": "1f886941a0f160d3cd64ff20e55d02e10ce2e2b5",
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        "time": "Wed May 20 20:25:59 2026 +0800"
      },
      "committer": {
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        "email": "jingsonglee0@gmail.com",
        "time": "Wed May 20 20:25:59 2026 +0800"
      },
      "message": "Remove support to macos-x86_64 because no resource to build\n"
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        "email": "45645138+QuakeWang@users.noreply.github.com",
        "time": "Wed May 20 19:10:55 2026 +0800"
      },
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        "time": "Wed May 20 19:10:55 2026 +0800"
      },
      "message": "fix: honor projection for monolithic buckets (#18)"
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    {
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        "time": "Wed May 20 18:12:00 2026 +0800"
      },
      "committer": {
        "name": "JingsongLi",
        "email": "jingsonglee0@gmail.com",
        "time": "Wed May 20 18:12:03 2026 +0800"
      },
      "message": "Add schedule and workflow_dispatch triggers to publish_snapshot\n"
    },
    {
      "commit": "3f50e0b9d6f6398ff299fb2fd0557e05e8090c67",
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        "email": "jingsonglee0@gmail.com",
        "time": "Wed May 20 18:08:10 2026 +0800"
      },
      "committer": {
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        "email": "noreply@github.com",
        "time": "Wed May 20 18:08:10 2026 +0800"
      },
      "message": "Expose row_group_num_rows from MosaicReader for all language bindings (#17)\n\nAdd a lightweight API to get the row count of a specific row group\ndirectly from file metadata without opening a full RowGroupReader."
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    {
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        "email": "jingsonglee0@gmail.com",
        "time": "Wed May 20 16:10:57 2026 +0800"
      },
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        "email": "noreply@github.com",
        "time": "Wed May 20 16:10:57 2026 +0800"
      },
      "message": "Expose ColumnStatistics from MosaicWriter for all language bindings (#16)\n\nAfter close(), writer stats are available without re-reading the file.\nThis is useful for Paimon to obtain min/max statistics immediately\nafter writing for indexing and metadata purposes.\n\nChanges across all layers:\n- Rust core: add num_row_groups() and row_group_stats() to MosaicWriter\n- JNI: add 6 native functions for writer stats access\n- FFI: add C API functions for writer stats (used by Python and C++)\n- Java: MosaicWriter caches stats on close(), exposes via\n  numRowGroups() and getRowGroupStatistics(rg)\n- Python: MosaicWriter collects stats on close(), exposes via\n  num_row_groups property and get_row_group_statistics(rg)\n- Docs: updated all 4 language API docs (Rust, Java, Python, C++)"
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    {
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      "tree": "967fe59cb0d234160ca48cc14562bda9a44e4bc0",
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        "email": "45645138+QuakeWang@users.noreply.github.com",
        "time": "Wed May 20 14:23:22 2026 +0800"
      },
      "committer": {
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        "email": "noreply@github.com",
        "time": "Wed May 20 14:23:22 2026 +0800"
      },
      "message": "Fix Java reader handle leak on constructor failure (#14)"
    },
    {
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        "email": "jingsonglee0@gmail.com",
        "time": "Wed May 20 14:21:12 2026 +0800"
      },
      "committer": {
        "name": "GitHub",
        "email": "noreply@github.com",
        "time": "Wed May 20 14:21:12 2026 +0800"
      },
      "message": "Remove release-cpp.yml (#15)"
    },
    {
      "commit": "d481ff1628ce97894b02b637314e2e13354b2c21",
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        "email": "jingsonglee0@gmail.com",
        "time": "Wed May 20 13:54:18 2026 +0800"
      },
      "committer": {
        "name": "GitHub",
        "email": "noreply@github.com",
        "time": "Wed May 20 13:54:18 2026 +0800"
      },
      "message": "Prepare release yml and tools (#11)"
    },
    {
      "commit": "dba937be4876c2018f925d61eb7683c26496d47f",
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        "email": "45645138+QuakeWang@users.noreply.github.com",
        "time": "Wed May 20 13:16:36 2026 +0800"
      },
      "committer": {
        "name": "GitHub",
        "email": "noreply@github.com",
        "time": "Wed May 20 13:16:36 2026 +0800"
      },
      "message": "Fix JNI Arrow C Data ownership (#10)"
    },
    {
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        "email": "jingsonglee0@gmail.com",
        "time": "Wed May 20 13:09:11 2026 +0800"
      },
      "committer": {
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        "email": "noreply@github.com",
        "time": "Wed May 20 13:09:11 2026 +0800"
      },
      "message": "Add Java snapshot publishing workflow and deploy settings (#13)"
    },
    {
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      "tree": "aae13ee71a3a45356c35ee3217d88a7a3ac35d45",
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        "email": "jingsonglee0@gmail.com",
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      },
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        "email": "noreply@github.com",
        "time": "Wed May 20 11:57:20 2026 +0800"
      },
      "message": "Rename Java package to org.apache.paimon.mosaic and update pom.xml (#12)\n\n- Rename package from io.mosaic to org.apache.paimon.mosaic\n- Update groupId to org.apache.paimon.mosaic with Apache parent pom\n- Downgrade to Java 1.8 source/target and Arrow 15.0.0\n- Add enhanced NativeLib with JAR-embedded native library loading\n- Add release profile with GPG signing and enforcer plugin\n- Update JNI function names to match new package path"
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        "email": "jingsonglee0@gmail.com",
        "time": "Tue May 19 19:42:29 2026 +0800"
      },
      "committer": {
        "name": "GitHub",
        "email": "noreply@github.com",
        "time": "Tue May 19 19:42:29 2026 +0800"
      },
      "message": "Add docs: design, rust-api, cpp-api, java-api and python-api (#9)"
    },
    {
      "commit": "0df16acb520104cb36b7e882b09248b3473d02a8",
      "tree": "dbb40ddb611b08326a206df9557c2c2cad71de96",
      "parents": [
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      "author": {
        "name": "Jingsong Lee",
        "email": "jingsonglee0@gmail.com",
        "time": "Tue May 19 16:24:14 2026 +0800"
      },
      "committer": {
        "name": "GitHub",
        "email": "noreply@github.com",
        "time": "Tue May 19 16:24:14 2026 +0800"
      },
      "message": "Add Python bindings and CI test job (#8)"
    },
    {
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      ],
      "author": {
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        "email": "45645138+QuakeWang@users.noreply.github.com",
        "time": "Tue May 19 15:41:27 2026 +0800"
      },
      "committer": {
        "name": "GitHub",
        "email": "noreply@github.com",
        "time": "Tue May 19 15:41:27 2026 +0800"
      },
      "message": "fix: preserve paged all-null projections (#7)"
    },
    {
      "commit": "35b5bfbec6d6bcf05cbf63721187a0af49610a55",
      "tree": "0a4271bdc799f6db11a1cb91f7864e52934f92c8",
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      "author": {
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        "email": "jingsonglee0@gmail.com",
        "time": "Tue May 19 11:06:37 2026 +0800"
      },
      "committer": {
        "name": "GitHub",
        "email": "noreply@github.com",
        "time": "Tue May 19 11:06:37 2026 +0800"
      },
      "message": "Add Java/JNI bindings and CI test job (#6)\n\nEnabling Java applications to use MosaicWriter/MosaicReader via Arrow C Data Interface over JNI."
    },
    {
      "commit": "eba2108971f3e91749c36c441b8b7deb49963488",
      "tree": "ee4fa2a9357cc983387ca49430fbcfaaec627101",
      "parents": [
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      ],
      "author": {
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        "email": "jingsonglee0@gmail.com",
        "time": "Tue May 19 10:25:41 2026 +0800"
      },
      "committer": {
        "name": "GitHub",
        "email": "noreply@github.com",
        "time": "Tue May 19 10:25:41 2026 +0800"
      },
      "message": "Add ffi and cpp (#4)\n\n- ffi crate: C API via Arrow C Data Interface for writer and reader,\n  with cbindgen-generated header\n- include/mosaic.hpp: C++ RAII wrapper (Writer, Reader, statistics)\n- cpp/: CMake project with integration tests covering roundtrip,\n  nulls, all types, projection, statistics, compression, schema\n  export, and multiple row groups"
    },
    {
      "commit": "c838f628dbf90d30a7f559f81739e5dac750bf95",
      "tree": "39586688c922ae33be08d870a957400d270e3048",
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      ],
      "author": {
        "name": "QuakeWang",
        "email": "45645138+QuakeWang@users.noreply.github.com",
        "time": "Tue May 19 10:14:33 2026 +0800"
      },
      "committer": {
        "name": "GitHub",
        "email": "noreply@github.com",
        "time": "Tue May 19 10:14:33 2026 +0800"
      },
      "message": "Optimize projected read buffer copies (#5)"
    },
    {
      "commit": "daf40d6bc9d72e687924e126fdb72bc8598eb332",
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      "message": "[core] Add column statistics and tests\n\n- stats.rs: per-column min/max/null-count statistics with\n  serialization/deserialization support\n- Wire stats into writer (collection + serialization) and\n  reader (deserialization + row_group_stats API)\n- reader_tests.rs: unit tests for reader functionality\n- robustness_test.rs: edge-case and corruption tests\n- stress_test.rs: large-scale and performance tests\n"
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        "time": "Mon May 18 15:22:37 2026 +0800"
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        "time": "Mon May 18 15:16:22 2026 +0800"
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        "email": "jingsonglee0@gmail.com",
        "time": "Mon May 18 13:59:16 2026 +0800"
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      "message": "[ci] Add GitHub Actions workflow for build, test, clippy, and fmt\n"
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        "time": "Mon May 18 13:53:27 2026 +0800"
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      "message": "[core] Add mosaic-core crate with format spec, reader, and writer\n\nInitial contribution of the Mosaic file format core library:\n- Format specification (spec.rs): magic bytes, version, footer layout,\n  bucket layouts (monolithic and paged), encoding types\n- Schema (schema.rs): column metadata, bucket assignment, serialization\n- Writer (writer.rs, bucket_writer.rs): row-group-based writer with\n  automatic encoding selection (const, dict, plain), zstd compression,\n  and paged bucket support for wide tables\n- Reader (reader.rs, bucket_reader.rs): two-round IO strategy with\n  range coalescing, column projection, paged bucket optimization\n- Types (types.rs, values.rs): type system mapping to Arrow types\n- Utilities (varint.rs, bpe.rs): variable-length integer encoding,\n  byte-pair encoding for string compression\n"
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        "time": "Mon May 18 13:25:14 2026 +0800"
      },
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        "name": "JingsongLi",
        "email": "jingsonglee0@gmail.com",
        "time": "Mon May 18 13:25:14 2026 +0800"
      },
      "message": "Update README.md\n"
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        "email": "jingsonglee0@gmail.com",
        "time": "Mon May 18 13:22:48 2026 +0800"
      },
      "committer": {
        "name": "JingsongLi",
        "email": "jingsonglee0@gmail.com",
        "time": "Mon May 18 13:22:48 2026 +0800"
      },
      "message": "Add project basic files\n"
    },
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        "email": "jingsonglee0@gmail.com",
        "time": "Mon May 18 13:14:12 2026 +0800"
      },
      "committer": {
        "name": "JingsongLi",
        "email": "jingsonglee0@gmail.com",
        "time": "Mon May 18 13:14:12 2026 +0800"
      },
      "message": "first commit\n"
    }
  ]
}