Angus Hollands created ARROW-13153:
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Summary: `parquet_dataset` loses ordering of files in `_metadata`
Key: ARROW-13153
URL: https://issues.apache.org/jira/browse/ARROW-13153
Project: Apache Arrow
Issue Type: Bug
Components: Parquet
Reporter: Angus Hollands
Hi all, thanks for the useful library!
I noticed when calling {{pyarrow.dataset.parquet_dataset}}
that the order of the files ({{dataset.files}}) does not match that which is
stored in {{_metadata}} via the `metadata.row_group(i).column(0).file_path`.
I'm not an Arrow expert by any means, but is this intentional?
I think the unordered map is the culprit, but I have not recompiled to test
this theory.
[https://github.com/apache/arrow/blob/133b1a904bf7fc1d24343c306a2279e27d4ebe6d/cpp/src/arrow/dataset/file_parquet.cc#L870]
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