jorisvandenbossche commented on a change in pull request #9967:
URL: https://github.com/apache/arrow/pull/9967#discussion_r610816204
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File path: python/pyarrow/parquet.py
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@@ -1891,6 +1892,14 @@ def write_to_dataset(table, root_path,
partition_cols=None,
file metadata instances of dataset pieces. The file paths in the
ColumnChunkMetaData will be set relative to `root_path`.
"""
+ if use_legacy_dataset is None:
Review comment:
They will get an error about an unrecognized file system (the same error
as you get now passing such a filesystem, as in ARROW-12299).
I could add a check for it and raise a bit more informative error message
(but it should be rather rare to do that I think)
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