[jira] [Updated] (ARROW-13153) [C++] `parquet_dataset` loses ordering of files in `_metadata`

["Weston Pace (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-13153?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Weston Pace updated ARROW-13153:
--------------------------------
    Summary: [C++] `parquet_dataset` loses ordering of files in `_metadata`  (was: `parquet_dataset` loses ordering of files in `_metadata`)

> [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
>
> 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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