scikit-hep/awkward

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Manipulate JSON-like data with NumPy-like idioms.

Stars: 976
Forks: 139
Open beginner issues: 0
Indexed issues: 206
Avg merge: 5d 7h
Merged PRs (30d): 23

Dominant language: Python
License: BSD-3-Clause
Last GitHub push: Sep 19, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue

Beginner friendly Everything

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206 open issues indexed

`cp315t-win32` wheel fails 22 AwkwardForth tests, blocking Deploy C++ Open

bug (unverified)

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

scikit-hep/awkward#4359 · 1 comment · Opened Sep 17, 2026
Revise `CONTRIBUTING.md` with AI contributions and reviews as the premise Open

docs

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

scikit-hep/awkward#4329 · 1 reaction · Opened Sep 10, 2026
`ak.array_equal` is False for equal unions with list-of-records child and reordered index Open

bug (unverified)

scikit-hep/awkward#4316 · 1 comment · 1 assignee · Opened Aug 24, 2026
For CUDA backend, broadcast against jagged array with empty trailing row gives silently wrong result Open

bug (unverified)

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

scikit-hep/awkward#4310 · Opened Aug 18, 2026
`to_parquet` roundtrip fails on an `UnmaskedArray` field of a record with null rows Open

bug (unverified)

Difficulty 4/5 3-5 days Newbie friendliness 57/100

scikit-hep/awkward#4305 · Opened Aug 14, 2026
REPL doesn't work anymore Open

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

scikit-hep/awkward#4304 · 1 comment · Opened Aug 13, 2026
`ak.ravel` raises `AssertionError` on a record under an option beside a non-record leaf Open

bug (unverified)

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

scikit-hep/awkward#4283 · Opened Jul 31, 2026
`ak.ravel` raises `OverflowError` when a temporal value does not fit the merged unit Open

bug (unverified)

scikit-hep/awkward#4280 · 1 comment · 1 assignee · Opened Jul 31, 2026
`ak.ravel` raises `OverflowError` when temporal leaves need an overflowing unit conversion Open

bug (unverified)

scikit-hep/awkward#4278 · 2 comments · 1 assignee · Opened Jul 31, 2026
Follow up on #4256 Open

feature

scikit-hep/awkward#4277 · 1 assignee · Opened Jul 31, 2026
`ak.to_arrow_table` fails for an `UnmaskedArray` of records with a uint32-indexed field Open

bug (unverified)

Difficulty 2/5 1-3 hours Newbie friendliness 86/100

scikit-hep/awkward#4274 · Opened Jul 30, 2026
Single-pass Welford (n, mean, M2) fused moments reducer for var/std Open

feature

scikit-hep/awkward#4269 · 1 assignee · Opened Jul 30, 2026
Copy-free weighted var/std/moment/mean via a two-input segmented reduce Open

feature

scikit-hep/awkward#4268 · 1 assignee · Opened Jul 30, 2026
Reducers fail on an option type inside a `RegularArray`'s untrimmed content Open

bug (unverified)

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

scikit-hep/awkward#4264 · 1 comment · Opened Jul 29, 2026
`ak.broadcast_arrays` fails for a flat array and a regular list of variable-length lists Open

bug (unverified)

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

scikit-hep/awkward#4262 · Opened Jul 29, 2026
`ak.ravel` raises internal errors when the collected leaves cannot merge Open

bug (unverified)

scikit-hep/awkward#4261 · 2 comments · 1 assignee · Opened Jul 29, 2026
`ak.flatten` with negative `axis` raises `AssertionError` when record field depths differ Open

bug (unverified)

Difficulty 3/5 1-2 days Newbie friendliness 75/100

scikit-hep/awkward#4260 · Opened Jul 29, 2026
Nearly all reducers and sorting raise `KeyError` on `float16`/`float128`/`complex256` Open

bug

scikit-hep/awkward#4259 · 2 comments · 1 assignee · Opened Jul 29, 2026
`ak.from_arrow` fails on an option record with an `IndexedArray`-of-`EmptyArray` field Open

bug (unverified)

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

scikit-hep/awkward#4255 · Opened Jul 28, 2026
`mask_identity=False` non-reducers fill temporal dtypes with `nan`, producing a `union[…, float64]` Open

bug (unverified)

scikit-hep/awkward#4254 · 1 assignee · Opened Jul 27, 2026
`ak.broadcast_arrays` silently skips broadcasting on some union-containing arrays Open

bug (unverified)

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

scikit-hep/awkward#4247 · Opened Jul 27, 2026
`to_json` writes lone-surrogate escapes that `from_json` rejects Open

bug (unverified)

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

scikit-hep/awkward#4244 · Opened Jul 24, 2026
`from_json` silently wraps JSON integers in [2^63, 2^64) to negative int64 Open

bug (unverified)

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

scikit-hep/awkward#4243 · Opened Jul 24, 2026
`from_json` raises `TypeError` when JSON mixes null with heterogeneous values Open

bug (unverified)

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

scikit-hep/awkward#4242 · Opened Jul 24, 2026
`from_json` parses floats at reduced precision; values drift on each reparse Open

bug (unverified)

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

scikit-hep/awkward#4241 · Opened Jul 24, 2026
`to_feather` writes union-type arrays as invalid files; `from_feather` crashes on read Open

bug (unverified)

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

scikit-hep/awkward#4238 · Opened Jul 23, 2026
CI: Cling memory error flake analysis Open

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

scikit-hep/awkward#4237 · Opened Jul 23, 2026
`from_arrow` raises `AttributeError` for a table with a null-type column Open

bug (unverified)

Difficulty 3/5 1-2 days Newbie friendliness 70/100

scikit-hep/awkward#4230 · Opened Jul 22, 2026
`from_arrow` loses the length of a size-0 fixed-size list Open

bug (unverified)

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

scikit-hep/awkward#4229 · Opened Jul 22, 2026
`to_arrow` raises `IndexError` for valid unions with option-type children Open

bug (unverified)

Difficulty 3/5 1-2 days Newbie friendliness 74/100

scikit-hep/awkward#4228 · 1 comment · Opened Jul 22, 2026
`from_numpy` raises `ValueError` for `ndim>=3` masked arrays with a zero-length dimension Open

bug (unverified)

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

scikit-hep/awkward#4227 · Opened Jul 22, 2026
`from_numpy` fails for multidimensional masked string arrays with no masked elements Open

bug (unverified)

Difficulty 2/5 1-3 hours Newbie friendliness 82/100

scikit-hep/awkward#4226 · Opened Jul 22, 2026
Add `float64`-accumulator reduce kernels for overflow-safe `sum`/`mean`/`var`/`std` Open

feature

scikit-hep/awkward#4224 · 1 comment · 1 assignee · Opened Jul 22, 2026
`to_arrow` silently shifts list values when a nullable list's offsets do not start at zero Open

bug (unverified)

Difficulty 2/5 1-3 hours Newbie friendliness 74/100

scikit-hep/awkward#4222 · 1 comment · Opened Jul 21, 2026
`to_arrow` raises `IndexError` for a non-empty option array with zero-length list content Open

bug (unverified)

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

scikit-hep/awkward#4221 · Opened Jul 21, 2026
`from_parquet` fails on NaT or out-of-range `datetime64[ms]`/`[us]` row-group statistics Open

bug (unverified)

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

scikit-hep/awkward#4220 · Opened Jul 21, 2026
`to_numpy` fails for option-type timedelta64 arrays that contain missing values Open

bug (unverified)

Difficulty 2/5 1-3 hours Newbie friendliness 88/100

scikit-hep/awkward#4217 · Opened Jul 21, 2026
GPT-5.6 Sol Review of Awkward Open

ai-generated bug gpu performance tests

Difficulty 5/5 Over a week Newbie friendliness 38/100

scikit-hep/awkward#4216 · 1 comment · Opened Jul 21, 2026
FutureWarning: `pyarrow.feather.write_feather` is deprecated as of 24.0.0. Open

feature

scikit-hep/awkward#4199 · 4 comments · 1 assignee · Opened Jul 10, 2026
`ak.from_rdataframe` issue on MacOS Open

bug (unverified)

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

scikit-hep/awkward#4193 · 2 comments · Opened Jul 8, 2026
awkward_RegularArray_combinations_64.cu Open

gpu

scikit-hep/awkward#4188 · 1 assignee · Opened Jul 6, 2026
awkward_ListOffsetArray_reduce_nonlocal_outstartsstops_64.cu Open

gpu

scikit-hep/awkward#4187 · 1 assignee · Opened Jul 6, 2026
awkward_ListOffsetArray_flatten_offsets.cu Open

gpu

scikit-hep/awkward#4186 · 1 assignee · Opened Jul 6, 2026
jsonschema for awkward forms Open

feature

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

scikit-hep/awkward#4169 · 4 comments · Opened Jul 1, 2026
Follow-up: open concerns from #4056 (no user-code-breaking risk) Open

scikit-hep/awkward#4157 · 4 comments · 1 reaction · 1 assignee · Opened Jun 30, 2026
`is_unique(axis=None)` does not check that list/record categories are distinct Open

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

scikit-hep/awkward#4154 · Opened Jun 25, 2026
Proposal: a lazy, fusing evaluation graph for `ak.Array` on the CUDA backend, backed by Parrot Open

feature gpu

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

scikit-hep/awkward#4141 · 1 comment · 1 reaction · Opened Jun 15, 2026
Use standard C++ type aliases Open

bug (unverified)

Difficulty 3/5 1-2 days Newbie friendliness 45/100

scikit-hep/awkward#4043 · Opened May 12, 2026
awkward_RegularArray_getitem_next_array_regularize.cu Open

gpu

Difficulty 5/5 Over a week Newbie friendliness 15/100

scikit-hep/awkward#4032 · 1 comment · Opened May 11, 2026
awkward_ListOffsetArray_toRegularArray.cu Open

gpu

scikit-hep/awkward#4031 · 1 comment · Opened May 11, 2026

scikit-hep/awkward

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