Wes McKinney created ARROW-9924:
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Summary: [Python] Performance regression reading individual
Parquet files using Dataset interface
Key: ARROW-9924
URL: https://issues.apache.org/jira/browse/ARROW-9924
Project: Apache Arrow
Issue Type: Bug
Components: Python
Reporter: Wes McKinney
Fix For: 2.0.0
I haven't investigated very deeply but this seems symptomatic of a problem:
{code}
In [27]: df = pd.DataFrame({'A': np.random.randn(10000000)})
In [28]: pq.write_table(pa.table(df), 'test.parquet')
In [29]: timeit pq.read_table('test.parquet')
79.8 ms ± 1.25 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
In [30]: timeit pq.read_table('test.parquet', use_legacy_dataset=True)
66.4 ms ± 1.33 ms per loop (mean ± std. dev. of 7 runs, 10 loops each)
{code}
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