eitsupi commented on code in PR #13677:
URL: https://github.com/apache/arrow/pull/13677#discussion_r957160830


##########
python/pyarrow/tests/test_dataset.py:
##########
@@ -4192,27 +4192,27 @@ def test_write_table_multiple_fragments(tempdir):
     # Table with multiple batches written as single Fragment by default
     base_dir = tempdir / 'single'
     ds.write_dataset(table, base_dir, format="feather")
-    assert set(base_dir.rglob("*")) == set([base_dir / "part-0.feather"])
+    assert set(base_dir.rglob("*")) == set([base_dir / "part-0.arrow"])
     assert ds.dataset(base_dir, format="ipc").to_table().equals(table)
 
     # Same for single-element list of Table
     base_dir = tempdir / 'single-list'
     ds.write_dataset([table], base_dir, format="feather")
-    assert set(base_dir.rglob("*")) == set([base_dir / "part-0.feather"])
+    assert set(base_dir.rglob("*")) == set([base_dir / "part-0.arrow"])
     assert ds.dataset(base_dir, format="ipc").to_table().equals(table)
 
     # Provide list of batches to write multiple fragments
     base_dir = tempdir / 'multiple'
     ds.write_dataset(table.to_batches(), base_dir, format="feather")
     assert set(base_dir.rglob("*")) == set(
-        [base_dir / "part-0.feather"])
+        [base_dir / "part-0.arrow"])

Review Comment:
   > No. Normally, users use `pyarrow.ipc.open_file()`/`pyarrow.ipc.new_file()` 
for it. See also:
   
   Oh...... I really did not know that.
   
   This is the part I was actually looking at because I believed these 
references were classified as "Tabular File Formats".
   
   
![image](https://user-images.githubusercontent.com/50911393/187181281-da96cca9-64a5-462f-9b41-4c46db3edd1e.png)
   



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