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sciexp
/
fixtures

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test-fixtures
duckdb
ducklake
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The dataset viewer is not available for this split.
Cannot load the dataset split (in streaming mode) to extract the first rows.
Error code:   StreamingRowsError
Exception:    CastError
Message:      Couldn't cast
mission_crew_id: int32
mission_id: int32
astronaut_id: int32
role: string
primary_crew: bool
backup_crew: bool
to
{'astronaut_id': Value('int32'), 'name': Value('string'), 'nationality': Value('string'), 'birth_date': Value('date32'), 'agency': Value('string'), 'first_flight': Value('date32'), 'total_flights': Value('int32'), 'total_eva_hours': Value('decimal128(5, 2)'), 'total_space_days': Value('decimal128(7, 2)'), 'status': Value('string')}
because column names don't match
Traceback:    Traceback (most recent call last):
                File "/src/services/worker/src/worker/utils.py", line 99, in get_rows_or_raise
                  return get_rows(
                         ^^^^^^^^^
                File "/src/libs/libcommon/src/libcommon/utils.py", line 272, in decorator
                  return func(*args, **kwargs)
                         ^^^^^^^^^^^^^^^^^^^^^
                File "/src/services/worker/src/worker/utils.py", line 77, in get_rows
                  rows_plus_one = list(itertools.islice(ds, rows_max_number + 1))
                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/iterable_dataset.py", line 2431, in __iter__
                  for key, example in ex_iterable:
                                      ^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/iterable_dataset.py", line 1952, in __iter__
                  for key, pa_table in self._iter_arrow():
                                       ^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/iterable_dataset.py", line 1975, in _iter_arrow
                  for key, pa_table in self.ex_iterable._iter_arrow():
                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/iterable_dataset.py", line 503, in _iter_arrow
                  for key, pa_table in iterator:
                                       ^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/iterable_dataset.py", line 350, in _iter_arrow
                  for key, pa_table in self.generate_tables_fn(**gen_kwags):
                                       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/packaged_modules/parquet/parquet.py", line 106, in _generate_tables
                  yield f"{file_idx}_{batch_idx}", self._cast_table(pa_table)
                                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/packaged_modules/parquet/parquet.py", line 73, in _cast_table
                  pa_table = table_cast(pa_table, self.info.features.arrow_schema)
                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/table.py", line 2272, in table_cast
                  return cast_table_to_schema(table, schema)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                File "/usr/local/lib/python3.12/site-packages/datasets/table.py", line 2218, in cast_table_to_schema
                  raise CastError(
              datasets.table.CastError: Couldn't cast
              mission_crew_id: int32
              mission_id: int32
              astronaut_id: int32
              role: string
              primary_crew: bool
              backup_crew: bool
              to
              {'astronaut_id': Value('int32'), 'name': Value('string'), 'nationality': Value('string'), 'birth_date': Value('date32'), 'agency': Value('string'), 'first_flight': Value('date32'), 'total_flights': Value('int32'), 'total_eva_hours': Value('decimal128(5, 2)'), 'total_space_days': Value('decimal128(7, 2)'), 'status': Value('string')}
              because column names don't match

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sciexp/fixtures

Test fixtures and example datasets for sciexp.

Quick start 

git clone https://huggingface.co/datasets/sciexp/fixtures
cd fixtures
git lfs pull

Datasets

Space dataset

A relational dataset about space exploration demonstrating DuckLake workflows. Contains tables for astronauts, missions, spacecraft, and mission crew assignments.

duckdb -box < queries/space.sql
Manual DuckDB session

DuckDB can access Hugging Face datasets directly via the hf:// protocol. See also Access 150k+ datasets from Hugging Face with DuckDB.

Attach directly from Hugging Face:

INSTALL ducklake;
LOAD ducklake;
ATTACH 'ducklake:hf://datasets/sciexp/fixtures/lakes/frozen/space.db' AS space;
SHOW TABLES FROM space.main;

Or from a local clone:

ATTACH 'ducklake:lakes/frozen/space.db' AS space;

Attribution

The space missions dataset originates from:

Repository layout

Directory structure 
lakes/frozen/                DuckLake databases
  space.db                   Metadata database
  space/                     Parquet data files
queries/                     SQL scripts

Contributing

Authentication and push workflow

Push access requires Hugging Face authentication:

hf auth login --token "${HF_TOKEN}" --add-to-git-credential

Push changes:

git lfs push --all origin
git push
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