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https://issues.apache.org/jira/browse/ARROW-13269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17376610#comment-17376610
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Ben Kietzman commented on ARROW-13269:
--------------------------------------

arrow::dataset::FileWriter should probably have a partition_expression property 
(containing the partition information with which the file was written), which 
would probably help here

> [C++] [Dataset] pyarrow.parquet.write_to_dataset does not send full schema to 
> metadata_collector
> ------------------------------------------------------------------------------------------------
>
>                 Key: ARROW-13269
>                 URL: https://issues.apache.org/jira/browse/ARROW-13269
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>    Affects Versions: 4.0.0
>            Reporter: Weston Pace
>            Priority: Major
>
> If there are partition columns specified then the writers will only write the 
> non-partition columns and thus they will not contain the fields used for the 
> partition.



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