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https://issues.apache.org/jira/browse/ARROW-13153?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joris Van den Bossche updated ARROW-13153:
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Fix Version/s: 5.0.0
> [C++] `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
> Assignee: Weston Pace
> Priority: Major
> Labels: pull-request-available
> Fix For: 5.0.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> 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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