Issues

Fixed-shape ArrayXD pandas round trips lose row nulls and integer precision

huggingface/datasets#8888 · opened

on Oct 23, 2026

2

Dataset.from_sql caches different SQLAlchemy queries under the same key when bound values change

huggingface/datasets#8877 · opened

on Oct 22, 2026

1

IterableDataset.decode(False) has no effect after shard() on a streamed media dataset

huggingface/datasets#8863 · opened

on Oct 20, 2026

cast_column / cast are ignored on streaming datasets decoded in threads (audio sampling_rate, decode=False)

huggingface/datasets#8849 · opened

on Oct 18, 2026

to_sql with num_proc > 1 fails with 'table already exists' when a later batch reaches the database first

huggingface/datasets#8838 · opened

on Oct 17, 2026

Indexing a Dataset with a list or array of bools silently returns rows 0 and 1

huggingface/datasets#8836 · opened

on Oct 17, 2026

to_csv ignores the encoding argument and always writes UTF-8

huggingface/datasets#8832 · opened

on Oct 17, 2026

ClassLabel.cast_storage fails on a pandas Categorical column (dictionary-encoded Arrow storage)

huggingface/datasets#8830 · opened

on Oct 17, 2026

1

to_csv and to_sql with index=True restart the index at 0 in every batch

huggingface/datasets#8831 · opened

on Oct 17, 2026

Fatal `PyGILState_Release` at interpreter exit when streaming Parquet with pyarrow 25 (arrow#45214 workaround is gated to pyarrow <= 24)

huggingface/datasets#8793 · opened

on Oct 13, 2026

1

re-pushing all dataset partitions corrupts it

huggingface/datasets#8789 · opened

on Oct 12, 2026

1

Dataset.add_item fails when an existing struct-backed feature meets an inferred dictionary

huggingface/datasets#8766 · opened

on Oct 7, 2026

1

Dataset.shard raises IndexError for the empty shards when num_shards is larger than the dataset

huggingface/datasets#8763 · opened

on Oct 7, 2026

1

Audio array remains NumPy after Torch formatting

huggingface/datasets#8755 · opened

on Oct 6, 2026

2

Parquet export does not close its writer after a batch or metadata failure

huggingface/datasets#8743 · opened

on Oct 5, 2026

3

Parquet file with an empty row group fails to load: `ArrowInvalid: BatchSize must be greater than 0`

huggingface/datasets#8740 · opened

on Oct 5, 2026

1

concatenate_datasets(axis=1) crashes on arrow-backed IterableDatasets with different lengths

huggingface/datasets#8719 · opened

on Oct 1, 2026

1

Casting mixed JSON and plain strings to Json depends on row order and batch size

huggingface/datasets#8714 · opened

on Sep 30, 2026

1

JSON loader turns strings like "123" or "null" into other types in inferred Json columns

huggingface/datasets#8713 · opened

on Sep 30, 2026

1

string_to_dict maps fields to unrelated regex capture groups

huggingface/datasets#8709 · opened

on Sep 29, 2026

2

Skip constructing disabled `hf_tqdm` progress bars in `map_nested` and `_single_map_nested`

huggingface/datasets#8705 · opened

on Sep 28, 2026

Avoid repeated `np.lib.NumpyVersion(np.version)` parsing per column/row in `NumpyArrowExtractor._arrow_array_to_numpy`

huggingface/datasets#8704 · opened

on Sep 28, 2026

Windows: `load_dataset` fails with WinError 206 for moderately deep `cache_dir` because the lock filename duplicates the whole path

huggingface/datasets#8702 · opened

on Sep 27, 2026

Casting `large_string` / `string_view` to ClassLabel fails, so `Dataset.from_pandas(df, features=ClassLabel)` breaks with pandas 3

huggingface/datasets#8681 · opened

on Sep 24, 2026

load_dataset("json") fails on mixed-shape JSONL when a chunksize boundary separates the shapes

huggingface/datasets#8675 · opened

on Sep 23, 2026

1

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Issues

Fixed-shape ArrayXD pandas round trips lose row nulls and integer precision

Dataset.from_sql caches different SQLAlchemy queries under the same key when bound values change

IterableDataset.decode(False) has no effect after shard() on a streamed media dataset

cast_column / cast are ignored on streaming datasets decoded in threads (audio sampling_rate, decode=False)

to_sql with num_proc > 1 fails with 'table already exists' when a later batch reaches the database first

Indexing a Dataset with a list or array of bools silently returns rows 0 and 1

to_csv ignores the encoding argument and always writes UTF-8

ClassLabel.cast_storage fails on a pandas Categorical column (dictionary-encoded Arrow storage)

to_csv and to_sql with index=True restart the index at 0 in every batch

Fatal `PyGILState_Release` at interpreter exit when streaming Parquet with pyarrow 25 (arrow#45214 workaround is gated to pyarrow <= 24)

re-pushing all dataset partitions corrupts it

Dataset.add_item fails when an existing struct-backed feature meets an inferred dictionary

Dataset.shard raises IndexError for the empty shards when num_shards is larger than the dataset

Audio array remains NumPy after Torch formatting

Parquet export does not close its writer after a batch or metadata failure

Parquet file with an empty row group fails to load: `ArrowInvalid: BatchSize must be greater than 0`

concatenate_datasets(axis=1) crashes on arrow-backed IterableDatasets with different lengths

Casting mixed JSON and plain strings to Json depends on row order and batch size

JSON loader turns strings like "123" or "null" into other types in inferred Json columns

string_to_dict maps fields to unrelated regex capture groups

Skip constructing disabled `hf_tqdm` progress bars in `map_nested` and `_single_map_nested`

Avoid repeated `np.lib.NumpyVersion(np.version)` parsing per column/row in `NumpyArrowExtractor._arrow_array_to_numpy`

Windows: `load_dataset` fails with WinError 206 for moderately deep `cache_dir` because the lock filename duplicates the whole path

Casting `large_string` / `string_view` to ClassLabel fails, so `Dataset.from_pandas(df, features=ClassLabel)` breaks with pandas 3

load_dataset("json") fails on mixed-shape JSONL when a chunksize boundary separates the shapes