EnricoMi commented on code in PR #44470:
URL: https://github.com/apache/arrow/pull/44470#discussion_r2079083583


##########
python/pyarrow/dataset.py:
##########
@@ -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.

Review Comment:
   It is good to be redundant here if this reduces chance for users to miss the 
`preserve_order` option below.



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