A. Coady created ARROW-16015:
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Summary: Scanning batch size is limited to 65536 (2**16).
Key: ARROW-16015
URL: https://issues.apache.org/jira/browse/ARROW-16015
Project: Apache Arrow
Issue Type: Bug
Components: Python
Affects Versions: 7.0.0, 8.0.0
Environment: macOS
Reporter: A. Coady
[Scanning
batches|https://arrow.apache.org/docs/python/dataset.html#iterative-out-of-core-or-streaming-reads]
is documented to default to a batch size of 1,000,000. But the behavior is
that batch size defaults to - and is limited to - 65536.
{code:python}
In []: dataset.count_rows()
Out[]: 538038292
In []: next(dataset.to_batches()).num_rows
Out[]: 65536
In []: next(dataset.to_batches(batch_size=10**6)).num_rows
Out[]: 65536
In []: next(dataset.to_batches(batch_size=10**4)).num_rows
Out[]: 10000
{code}
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