EnricoMi commented on code in PR #44470:
URL: https://github.com/apache/arrow/pull/44470#discussion_r2079085897
##########
python/pyarrow/dataset.py:
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@@ -893,7 +893,12 @@ def write_dataset(data, base_dir, *,
basename_template=None, format=None,
``FileFormat.make_write_options()`` function.
use_threads : bool, default True
Write files in parallel. If enabled, then maximum parallelism will be
- used determined by the number of available CPU cores.
+ used determined by the number of available CPU cores. Using multiple
+ threads may change the order of rows in the written dataset.
+ preserve_order : bool, default False
+ Preserve the order of rows. If enabled, order of rows in the dataset
are
+ guaranteed to be preserved even if use_threads is enabled. This may
cause
+ notable performance degradation.
Review Comment:
```suggestion
guaranteed to be preserved even if use_threads is set to True. This
may
cause notable performance degradation.
```
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