[jira] [Commented] (ARROW-14010) [C++][Python] No way to generate UUID filenames with new datasets API

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

    [ https://issues.apache.org/jira/browse/ARROW-14010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17415794#comment-17415794 ] 

Weston Pace commented on ARROW-14010:
-------------------------------------

[~jorisvandenbossche] [~ldacey] Am I missing anything?  I really had thought this was possible but now I can't figure it out.

> [C++][Python] No way to generate UUID filenames with new datasets API
> ---------------------------------------------------------------------
>
>                 Key: ARROW-14010
>                 URL: https://issues.apache.org/jira/browse/ARROW-14010
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Weston Pace
>            Assignee: Weston Pace
>            Priority: Major
>
> I had assumed this could be done using the "partition_filename_cb" in "pyarrow.parquet.write_to_dataset" but that doesn't work if "use_legacy_dataset" is False.  The "basename_template" only allows string substitution so it cannot inject UUID.  Given that this is the only support for any kind of "append" mode when writing to datasets I think this feature is important and can block migration from the old writer.



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