pitrou commented on a change in pull request #8343:
URL: https://github.com/apache/arrow/pull/8343#discussion_r500272157
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File path: python/pyarrow/tests/test_dataset.py
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@@ -2124,6 +2124,23 @@ def test_dataset_project_only_partition_columns(tempdir):
assert all_cols.column('part').equals(part_only.column('part'))
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+def test_dataset_project_null_column(tempdir):
+ import pandas as pd
+ df = pd.DataFrame({"col": np.array([None, None, None], dtype='object')})
+
+ f = tempdir / "test_dataset_project_null_column.parquet"
+ df.to_parquet(f, engine="pyarrow")
+
+ import pyarrow as pa
+ import pyarrow.dataset as ds
Review comment:
These two imports should be unnecessary?
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