AlenkaF commented on code in PR #12838:
URL: https://github.com/apache/arrow/pull/12838#discussion_r855282124


##########
python/pyarrow/parquet/__init__.py:
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@@ -3116,6 +3136,14 @@ def file_visitor(written_file):
                              "'basename_template' parameter instead. For "
                              "usage see `pyarrow.dataset.write_dataset`"),
             FutureWarning, stacklevel=2)
+    if existing_data_behavior is not None:

Review Comment:
   Oh, of course. Then I think it is better to set the default to None and set 
it in the new API separately to "overwrite_or_ignore". What do u think?



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