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https://issues.apache.org/jira/browse/ARROW-18060?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Li updated ARROW-18060:
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Issue Type: Bug (was: Improvement)
> [C++] Writing a dataset with 0 rows doesn't create any files
> ------------------------------------------------------------
>
> Key: ARROW-18060
> URL: https://issues.apache.org/jira/browse/ARROW-18060
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Affects Versions: 9.0.0
> Reporter: David Li
> Priority: Major
>
> If the input data has no rows, no files get created. This is potentially
> unexpected as it looks like "nothing happened". It might be nicer to create
> an empty file. With partitioning, though, that then gets weird (there's no
> partition values) so maybe an error might make more sense instead.
> Reproduction in Python
> {code:python}
> import tempfile
> from pathlib import Path
> import pyarrow
> import pyarrow.dataset
> print("PyArrow version:", pyarrow.__version__)
> table = pyarrow.table([
> [],
> ], schema=pyarrow.schema([
> ("ints", "int64"),
> ]))
> with tempfile.TemporaryDirectory() as d:
> pyarrow.dataset.write_dataset(table, d, format="feather")
> print(list(Path(d).iterdir()))
> {code}
> Output
> {noformat}
> > python repro.py
> PyArrow version: 9.0.0
> [] {noformat}
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