lance-format/lance

View on GitHub

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: arrow offset overflow Open

bug

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

lance-format/lance#9223 · 1 comment · 1 reaction · Opened Sep 14, 2026
bug: a legacy Delete reinstates a data file a concurrent Project pruned Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 68/100

lance-format/lance#9217 · 2 comments · Opened Sep 14, 2026
bug: OSS branch listing omits names containing slashes Open

bug performance

Difficulty 3/5 1-2 days Newbie friendliness 48/100

lance-format/lance#9197 · Opened Sep 14, 2026
Fragment.take fails on non-monotonic offsets: "Encoding I/O returned N results for M requested range chunks" Open

bug

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

lance-format/lance#9157 · Opened Sep 11, 2026
`optimize_indices` cannot extend a scalar index created over a nested field of an empty dataset Open

bug

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

lance-format/lance#9145 · Opened Sep 11, 2026
Support of `take()` method for `LanceScanner` Open

feature

Difficulty 3/5 1-2 days Newbie friendliness 64/100

lance-format/lance#9142 · 3 comments · Opened Sep 11, 2026
bug(fts): limit/offset pagination skips and repeats equal-score results (Node 0.38/0.39 preview) Open

bug performance

Difficulty 5/5 Over a week Newbie friendliness 28/100

lance-format/lance#9132 · Opened Sep 10, 2026
feature: support cross-column vector refinement Open

feature performance

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

lance-format/lance#9126 · 5 comments · Opened Sep 10, 2026
feat(namespace): preserve Retry-After metadata on ThrottlingError Open

A-namespace enhancement feature good first issue

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

lance-format/lance#9113 · 6 comments · 1 reaction · Opened Sep 10, 2026
feature: support _rowoffset in scan filters beyond the IN-list take lowering Open

feature

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

lance-format/lance#9105 · Opened Sep 9, 2026
bug: row-address mask cache can serve a previous dataset's allow-list at the same URI Open

bug

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

lance-format/lance#9079 · Opened Sep 9, 2026
bug(overlay): struct cell validity is not replaced by a data overlay Open

bug

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

lance-format/lance#9077 · Opened Sep 9, 2026
bug: orphaned staging manifests in _versions/ are never garbage collected Open

bug

lance-format/lance#9061 · 1 comment · 1 assignee · Opened Sep 8, 2026
bug: FTS corpus statistics depend on the query filter and index coverage Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 62/100

lance-format/lance#9058 · 1 comment · Opened Sep 8, 2026
bug: Substrait expression transport cannot encode predicates on FixedSizeList columns Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

lance-format/lance#9056 · Opened Sep 8, 2026
bug: Windows CI flake - pytest-xdist workers race on the shared torchinductor cache Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 76/100

lance-format/lance#9055 · Opened Sep 8, 2026
perf: benchmark column-statistics collection, maintenance, and retrieval at scale Open

performance

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

lance-format/lance#9047 · Opened Sep 7, 2026
feature: resolve column statistics across index and seed coverage Open

feature

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

lance-format/lance#9046 · Opened Sep 7, 2026
feature: incrementally consolidate and backfill column statistics Open

feature performance

Difficulty 5/5 Over a week Newbie friendliness 30/100

lance-format/lance#9045 · Opened Sep 7, 2026
feature: share multi-column ZoneMap storage for column statistics Open

feature

Difficulty 5/5 Over a week Newbie friendliness 30/100

lance-format/lance#9044 · Opened Sep 7, 2026
Support safe concurrent publication of derived columns in the same fragment Open

feature

lance-format/lance#9043 · 1 assignee · Opened Sep 7, 2026
feature: Adopt rerun-io/lance-fuzz for continuous stateful dataset fuzzing Open

bug feature performance

Difficulty 5/5 Over a week Newbie friendliness 32/100

lance-format/lance#9039 · 5 comments · 3 reactions · Opened Sep 7, 2026
bug: MemWAL LSM scan fails with page_lookup.lance Not found after pk-only flush (flush publishes SSTable before pk sidecar exists) Open

bug performance

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

lance-format/lance#9035 · Opened Sep 7, 2026
bug: binary_quantization appends a spurious byte when the length is a multiple of 8 Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

lance-format/lance#9028 · Opened Sep 7, 2026
bug: KMeans panics on cosine over a float column instead of rejecting it Open

bug

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

lance-format/lance#9026 · Opened Sep 7, 2026
bug: BM25 FTS query attempts ~96 GiB allocation and aborts in `InvertedIndex::bm25_search_modern_candidates` (regression vs lance 10) Open

bug performance

Difficulty 4/5 3-5 days Newbie friendliness 38/100

lance-format/lance#9016 · Opened Sep 5, 2026
Add Blob V2 to the Spec Open

A-format

lance-format/lance#9014 · 1 reaction · 1 assignee · Opened Sep 4, 2026
bug: row_range panics where partition_size returns 0 for an absent partition Open

bug

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

lance-format/lance#9012 · Opened Sep 4, 2026
bug: create_index silently ignores num_partitions when ivf_centroids_file is given Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 64/100

lance-format/lance#9008 · Opened Sep 4, 2026
bug: an out-of-range precomputed partition id panics the IVF_PQ build Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 68/100

lance-format/lance#9003 · Opened Sep 4, 2026
Enable Fragment Reuse Index even when SRID is enabled Open

feature

Difficulty 5/5 Over a week Newbie friendliness 30/100

lance-format/lance#8977 · Opened Sep 3, 2026
Commit precondition on cells not changing. Open

feature

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

lance-format/lance#8976 · 3 comments · Opened Sep 3, 2026
Track Blob V2 Managed Kind Open

A-encoding A-format enhancement format-change

lance-format/lance#8971 · 1 assignee · Opened Sep 3, 2026
bug: Session::new eagerly creates a LocalSpillStore temp dir and panics when it cannot Open

bug

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

lance-format/lance#8948 · 1 comment · Opened Sep 2, 2026
bug: build_chunk_index passes a data_buf_size that disagrees with its chunk deltas Open

bug

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

lance-format/lance#8947 · 3 comments · Opened Sep 2, 2026
Avoid keeping all update data in memory in `update_columns` Open

feature performance

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

lance-format/lance#8939 · Opened Sep 2, 2026
feature: expose global BM25 statistics for distributed FTS executors Open

feature

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

lance-format/lance#8937 · Opened Sep 2, 2026
Epic: Stable Row IDs to production ready Open

epic

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

lance-format/lance#8931 · 4 reactions · Opened Sep 1, 2026
lance.Dataset has no way to get the commit timestamp of the version it is holding Open

feature

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

lance-format/lance#8928 · 1 comment · Opened Sep 1, 2026
bug: dist_table u16 accumulator may overflow at production dimensions, and the kernels disagree when it does Open

bug

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

lance-format/lance#8908 · 1 comment · Opened Aug 31, 2026
`Operation::Rewrite`'s `frag_reuse_index` is dropped when the transaction is serialized, so the deferred-remap conflict exemption never applies to a competing transaction Open

feature

Difficulty 3/5 1-2 days Newbie friendliness 76/100

lance-format/lance#8896 · 1 comment · Opened Aug 31, 2026
update_columns on a heavily deleted fragment fails with "Failed to add blanks: Offset overflow error" Open

bug feature

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

lance-format/lance#8890 · Opened Aug 31, 2026
feature: unified FileSystem abstraction over local and object storage Open

feature performance

lance-format/lance#8889 · 1 comment · 1 assignee · Opened Aug 31, 2026
bug: safe SIMD From impls execute AVX loads with no runtime gate on x86_64 Open

bug performance

Difficulty 4/5 3-5 days Newbie friendliness 38/100

lance-format/lance#8872 · Opened Aug 30, 2026
feature: add a backwards-compatibility fixture written with stable row ids Open

feature performance

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

lance-format/lance#8854 · Opened Aug 28, 2026
perf: change-data-feed queries scan every fragment instead of pruning on version metadata Open

performance

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

lance-format/lance#8853 · 3 comments · Opened Aug 28, 2026
perf: LIMIT/OFFSET pushdown is disabled on all stable-row-id datasets Open

performance

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

lance-format/lance#8850 · Opened Aug 28, 2026
perf: prefilter builds a whole-dataset allow list on stable-row-id datasets Open

performance

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

lance-format/lance#8849 · Opened Aug 28, 2026
Donation of `lance-cli` Open

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

lance-format/lance#8843 · 2 comments · Opened Aug 28, 2026
bug: FTS on a JSON subfield — path-scoped inverted index is silently inert, and non-triple queries panic Open

A-index bug

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

lance-format/lance#8812 · 1 comment · Opened Aug 26, 2026

lance-format/lance

Get new issues in your inbox