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Posted to dev@arrow.apache.org by "Joris Van den Bossche (Jira)" <ji...@apache.org> on 2020/03/31 13:49:00 UTC
[jira] [Created] (ARROW-8286) [Python] Creating dataset from
pathlib results in UnionDataset instead of FileSystemDataset
Joris Van den Bossche created ARROW-8286:
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Summary: [Python] Creating dataset from pathlib results in UnionDataset instead of FileSystemDataset
Key: ARROW-8286
URL: https://issues.apache.org/jira/browse/ARROW-8286
Project: Apache Arrow
Issue Type: Bug
Reporter: Joris Van den Bossche
Assignee: Joris Van den Bossche
Fix For: 0.17.0
{code}
import pyarrow as pa
import pyarrow.parquet as pq
import pyarrow.dataset as ds
table = pa.table({'a': np.random.randn(10), 'b': range(10), 'c': ['a', 'b'] * 5})
pq.write_table(table, "test.parquet")
import pathlib
ds.dataset(pathlib.Path("./test.parquet"))
# gives UnionDataset
ds.dataset(str(pathlib.Path("./test.parquet")))
# correctly gives FileSystemDataset
{code}
and since those two dataset classes have different API, this is important to give FileSystemDataset
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