lance-format/lance

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Open Lakehouse Format for Multimodal AI. Convert from Parquet in 2 lines of code for 100x faster random access, vector index, and data versioning. Compatible with Pandas, DuckDB, Polars, Pyarrow, and PyTorch with more integrations coming..

Stars: 7.1k
Forks: 852
Open beginner issues: 23
Indexed issues: 798
Avg merge: 3d 18h
Merged PRs (30d): 272

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 18, 2026
Latest indexed: Sep 18, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue help wanted

Beginner friendly Everything

Open All

798 open issues indexed

bug: JSON integers above i64::MAX break JSON index creation and typed reads; numbers above u64::MAX are silently truncated to f64 Open

A-index bug

lance-format/lance#8807 · 1 comment · 1 assignee · Opened Aug 26, 2026
docs: user guide says that the JSON is unsuppported in projections Open

A-docs

lance-format/lance#8804 · 1 reaction · 2 assignees · Opened Aug 26, 2026
Nicer accessors for JSON Open

enhancement

Difficulty 5/5 Over a week Newbie friendliness 35/100

lance-format/lance#8803 · Opened Aug 26, 2026
feature: add configurable fail-fast scheduler error handling Open

feature performance

Difficulty 5/5 Over a week Newbie friendliness 48/100

lance-format/lance#8781 · 2 comments · Opened Aug 26, 2026
perf: accelerate online IVF centroid routing with HNSW Open

feature performance

Difficulty 5/5 Over a week Newbie friendliness 35/100

lance-format/lance#8775 · 1 reaction · Opened Aug 26, 2026
bug: merge_insert analyze_plan reports the streaming plan for materialized sources Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

lance-format/lance#8771 · Opened Aug 26, 2026
bug: VariableFullZipDecoder aborts the process on corrupt page metadata Open

bug

lance-format/lance#8768 · 1 assignee · Opened Aug 26, 2026
bug: IVF_HNSW_PQ recall assertions fail intermittently because k-means init is unseeded Open

bug performance

Difficulty 3/5 1-2 days Newbie friendliness 78/100

lance-format/lance#8764 · 2 comments · Opened Aug 26, 2026
Add a strict expected-head dataset commit mode Open

enhancement

lance-format/lance#8699 · 1 assignee · Opened Aug 21, 2026
Resolve the Stable file-format selector to Lance 2.2 Open

A-format enhancement

lance-format/lance#8698 · 1 assignee · Opened Aug 21, 2026
Evaluate primitive predicates directly on encoded pages Open

A-encoding enhancement performance

lance-format/lance#8697 · 1 assignee · Opened Aug 21, 2026
Track physical column layout optimization Open

enhancement

lance-format/lance#8696 · 1 assignee · Opened Aug 21, 2026
Track encoded file concatenation and column slices Open

enhancement

lance-format/lance#8695 · 1 assignee · Opened Aug 21, 2026
Enforce unsafe practices with clippy Open

Difficulty 4/5 3-5 days Newbie friendliness 64/100

lance-format/lance#8678 · Opened Aug 20, 2026
docs: create a spec page listing all standard table configurations Open

A-docs documentation

lance-format/lance#8672 · 1 reaction · 2 assignees · Opened Aug 20, 2026
feature: quantized refinement results cache for high-bit RaBitQ/SQ Open

feature

Difficulty 5/5 Over a week Newbie friendliness 35/100

lance-format/lance#8634 · 1 comment · Opened Aug 19, 2026
bug: creating an IVF index on a float16 vector column hangs forever when values are large Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 58/100

lance-format/lance#8607 · Opened Aug 18, 2026
bug: u8x16 multiplication saturates on x86_64 but wraps on aarch64 Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 55/100

lance-format/lance#8578 · 1 comment · Opened Aug 17, 2026
debug_assert!(preamble_action == PreambleAction::Take) fires in DecodeMiniBlockTask::map_range on a multi-row take over a 2.1 list column whose rows each span multiple mini-block chunks (3.0.1 and 10.0.0) Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 42/100

lance-format/lance#8558 · Opened Aug 16, 2026
feature: track Lance Cell Flags Open

A-format enhancement feature

lance-format/lance#8547 · 1 assignee · Opened Aug 14, 2026
feat(java): expose mergeInsertUncommitted (execute_uncommitted) in Java SDK Open

feature

Difficulty 4/5 3-5 days Newbie friendliness 63/100

lance-format/lance#8546 · Opened Aug 14, 2026
Reuse scan schedulers for additional base paths instead of creating one per fragment open Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

lance-format/lance#8537 · Opened Aug 13, 2026
A tagged version permanently prevents `cleanup_old_versions` from reclaiming newer data files Open

bug performance

Difficulty 3/5 1-2 days Newbie friendliness 68/100

lance-format/lance#8516 · Opened Aug 12, 2026
Publish free-threaded (cp314t) wheels alongside the existing abi3 wheels Open

Difficulty 3/5 1-2 days Newbie friendliness 67/100

lance-format/lance#8500 · Opened Aug 12, 2026
parallelize zone statistics computation in scalar index training Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

lance-format/lance#8468 · Opened Aug 11, 2026
Dataset row id reuse old value when `enable_stable_row_ids` enabled Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

lance-format/lance#8466 · Opened Aug 11, 2026
feature: automatic ZoneMap-backed column statistics Open

feature performance

lance-format/lance#8461 · 2 comments · 1 assignee · Opened Aug 11, 2026
perf(v2.1): FullZip random point reads regress compared with format 0.1 Open

performance

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lance-format/lance#8430 · Opened Aug 9, 2026
feat: Add typed JSONPath extraction functions Open

feature

Difficulty 5/5 Over a week Newbie friendliness 45/100

lance-format/lance#8412 · Opened Aug 7, 2026
Feature Request: Go SDK for reading Lance datasets Open

feature

Difficulty 5/5 Over a week Newbie friendliness 35/100

lance-format/lance#8362 · 2 comments · Opened Aug 7, 2026
bug: a failed memtable flush is skipped by WAL replay once a later generation commits Open

bug

lance-format/lance#8293 · 1 assignee · Opened Aug 5, 2026
merge_insert violates a row-address ordering invariant during a full upsert Open

bug performance

Difficulty 4/5 3-5 days Newbie friendliness 42/100

lance-format/lance#8282 · 1 comment · Opened Aug 5, 2026
Full scan fails with an out-of-range projection after adding a column and compacting Open

bug

lance-format/lance#8281 · 1 comment · 1 assignee · Opened Aug 5, 2026
perf: HNSW post-alignment follow-ups — benchmark evidence and #5183 regression test Open

performance

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lance-format/lance#8276 · 3 comments · Opened Aug 5, 2026
HNSW search prefetch (do_prefetch/look-ahead) shows no benefit at 768 dimensions Open

performance

Difficulty 4/5 3-5 days Newbie friendliness 45/100

lance-format/lance#8275 · 1 comment · Opened Aug 5, 2026
update LanceNamespace::get_table_stats() to use manifests instead of file metadata Open

performance

Difficulty 3/5 1-2 days Newbie friendliness 68/100

lance-format/lance#8253 · 4 comments · Opened Aug 4, 2026
Support StringView type in FTS indices Open

A-index good first issue

Difficulty 3/5 1-2 days Newbie friendliness 66/100

lance-format/lance#8245 · 3 comments · Opened Aug 4, 2026
refactor: use LazyLock to initialize Field and Schema once Open

good first issue

Difficulty 4/5 3-5 days Newbie friendliness 52/100

lance-format/lance#8244 · 2 comments · Opened Aug 4, 2026
Use view types for sort-heavy workflows Open

performance

Difficulty 4/5 3-5 days Newbie friendliness 45/100

lance-format/lance#8239 · 1 comment · Opened Aug 4, 2026
bug: align mem_wal HNSW construction with the reference algorithm Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 45/100

lance-format/lance#8236 · Opened Aug 4, 2026
Support max_source_rows and max_source_bytes limits Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 55/100

lance-format/lance#8234 · Opened Aug 4, 2026
Upgrade DataFusion for the unparser stack-overflow fix Open

Difficulty 2/5 1-3 hours Newbie friendliness 72/100

lance-format/lance#8225 · Opened Aug 4, 2026
data_stats() table size undercounts blob v2 data Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 55/100

lance-format/lance#8193 · 2 comments · Opened Aug 3, 2026
Benchmark failure: merge-insert hash join exceeds bounded memory pool Open

benchmark bug performance

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lance-format/lance#8129 · Opened Aug 1, 2026
Performance regression: uncached FTS query suite (~35–49% slower since 2026-07-30) Open

performance

Difficulty 4/5 3-5 days Newbie friendliness 25/100

lance-format/lance#8125 · Opened Jul 31, 2026
The k value in top_k is too large, or the k value in limit k is too large, causing the task to core dump directly. Open

performance

Difficulty 4/5 3-5 days Newbie friendliness 35/100

lance-format/lance#8110 · Opened Jul 31, 2026
Move all indices to store row address instead of row id Open

A-index

Difficulty 5/5 Over a week Newbie friendliness 25/100

lance-format/lance#8085 · Opened Jul 29, 2026
bug: struct-nested blob v2 column cannot be compacted — "Blob struct missing `data` field" on any fragment rewrite Open

bug performance

lance-format/lance#8082 · 1 assignee · Opened Jul 29, 2026
measure random primary-key update performance Open

feature performance

Difficulty 4/5 3-5 days Newbie friendliness 48/100

lance-format/lance#8012 · Opened Jul 27, 2026
Add bounded generic-offset codec cascade Open

A-encoding enhancement

lance-format/lance#8009 · 1 assignee · Opened Jul 27, 2026

lance-format/lance

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