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

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

Weston Pace created ARROW-14010:
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             Summary: [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


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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