Version 2.10.0 · scikit-hep awkward · Discussion #4177 · GitHub

TaiSakuma
Jul 2, 2026
Maintainer

Highlights

Much faster list reductions (ak.sum, ak.max, …) — about 5× faster on average
(geometric mean), 10×+ on long lists feat: complete CPU kernel migration from parents to offsets #4056
- Kernels rewritten: CPU (awkward-cpp), GPU (cuda.compute)
- Exact floating-point results may differ from the previous release
- The same arrays may have different internal layouts than before
- Removed the undocumented ak.index.EmptyIndex / ZeroIndex / LazyIndex
Many bug fixes and improvements from code review by Claude Fable 5 (PRs 4089–4108) Claude Fable AI review for Awkward #4085

What's Changed

New features

feat: complete CPU kernel migration from parents to offsets by @ianna in feat: complete CPU kernel migration from parents to offsets #4056
feat: migrate UnionArray kernels to cuda.compute by @maxymnaumchyk in feat: migrate UnionArray kernels to cuda.compute #4083
feat: combine cuda.compute PRs into one by @maxymnaumchyk in feat: combine cuda.compute PRs into one #4124
feat: migrate kernels that were using parents to cuda.compute by @maxymnaumchyk in feat: migrate kernels that were using parents to cuda.compute #4159

Bug-fixes and performance

fix: add missing .attrs support in parquet serialisation by @albert-physics in fix: add missing .attrs support in parquet serialisation #4079
fix: test_pandas_attr_serialisation should have unique parquet path per thread by @ikrommyd in fix: test_pandas_attr_serialisation should have unique parquet path per thread #4110
fix: passing a non-Collection iterable to pytest.parametrize is deprecated by @maxymnaumchyk in fix: passing a non-Collection iterable to pytest.parametrize is deprecated #4144
fix: datetime.time conversion and binary buffer copy in bindings by @henryiii in fix: datetime.time conversion and binary buffer copy in bindings #4089
fix: properly error on conversion of IndexedOptionArray with an EmptyArray content and length > 0 to a ByteMaskedArray by @ikrommyd in fix: properly error on conversion of IndexedOptionArray with an EmptyArray content and length > 0 to a ByteMaskedArray #4127
fix: named-axis context sharing and ak.where broadcasting crash by @henryiii in fix: named-axis context sharing and ak.where broadcasting crash #4108
fix: require pyarrow>=17.0.0 by @henryiii in fix: require pyarrow>=17.0.0 #4152
fix: wrong results from string sort/unique kernels by @henryiii in fix: wrong results from string sort/unique kernels #4091
fix: int64 precision loss in sort comparators and per-comparison branching by @henryiii in fix: int64 precision loss in sort comparators and per-comparison branching #4090
fix: LayoutBuilder Union form JSON and Record map-type support by @henryiii in fix: LayoutBuilder Union form JSON and Record map-type support #4094
fix: misc integration bugs (hist, avro, numexpr, RDataFrame) by @henryiii in fix: misc integration bugs (hist, avro, numexpr, RDataFrame) #4096
fix: modify cache key for macOS deployment in workflow by @ianna in fix: modify cache key for macOS deployment in workflow #4158
fix: reject non-integer float indices instead of truncating by @henryiii in fix: reject non-integer float indices instead of truncating #4097
fix: typetracer correctness issues affecting dask-awkward by @henryiii in fix: typetracer correctness issues affecting dask-awkward #4100
fix: BitMaskedArray mask inversion and placeholder detection by @henryiii in fix: BitMaskedArray mask inversion and placeholder detection #4092
fix: Arrow conversion without pandas, empty chunked arrays, and multi-file Parquet attrs by @henryiii in fix: Arrow conversion without pandas, empty chunked arrays, and multi-file Parquet attrs #4099
fix: BitMasked builder use-after-free and GrowableBuffer copy bugs by @henryiii in fix: BitMasked builder use-after-free and GrowableBuffer copy bugs #4098

Other

ci: fix deploy job by @ariostas in ci: fix deploy job #4082
chore: add an AGENTS file by @henryiii in chore: add an AGENTS file #4086
chore: don't refuse to install awkward_cpp when using uv by @henryiii in chore: don't refuse to install awkward_cpp when using uv #4087
chore(deps): bump the actions group with 3 updates by @dependabot[bot] in chore(deps): bump the actions group with 3 updates #4121
docs: add albert-physics as a contributor for code by @allcontributors[bot] in docs: add albert-physics as a contributor for code #4122
ci: automate release-note categorization with type labels by @TaiSakuma in ci: automate release-note categorization with type labels #4125
docs: document kernel spec invariants and CPU/CUDA equivalence in AGENTS by @henryiii in docs: document kernel spec invariants and CPU/CUDA equivalence in AGENTS #4088
ci: run property-based tests nightly with a large max_examples by @TaiSakuma in ci: run property-based tests nightly with a large max_examples #4128
test: add a property-based kernel test with CPU and GPU backends by @TaiSakuma in test: add a property-based kernel test with CPU and GPU backends #4142
ci: show Hypothesis statistics in the nightly property tests by @TaiSakuma in ci: show Hypothesis statistics in the nightly property tests #4146
chore: modernize header-only code to C++17 and remove dead code by @henryiii in chore: modernize header-only code to C++17 and remove dead code #4104
ci: run the GPU kernel property tests nightly at the nightly profile by @TaiSakuma in ci: run the GPU kernel property tests nightly at the nightly profile #4147
ci: enable pyodide build by @ryanking13 in ci: enable pyodide build #4149
ci: fix docs-preview PR comment failing without a checkout by @TaiSakuma in ci: fix docs-preview PR comment failing without a checkout #4155
chore(deps): bump the actions group across 1 directory with 3 updates by @dependabot[bot] in chore(deps): bump the actions group across 1 directory with 3 updates #4153
docs: describe the returned object in Returns: for already-merged operations by @TaiSakuma in docs: describe the returned object in Returns: for already-merged operations #4148
chore(deps): update python version for mypy by @maxymnaumchyk in chore(deps): update python version for mypy #4172

New Contributors

@albert-physics made their first contribution in fix: add missing .attrs support in parquet serialisation #4079
@ryanking13 made their first contribution in ci: enable pyodide build #4149

Full Changelog: v2.9.1...v2.10.0

This discussion was created from the release Version 2.10.0.

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