[jira] [Commented] (ARROW-10695) [C++][Dataset] Allow to use a UUID in the basename_template when writing a dataset

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-10695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17243918#comment-17243918 ] 

Joris Van den Bossche commented on ARROW-10695:
-----------------------------------------------

cc [~bkietz]

> [C++][Dataset] Allow to use a UUID in the basename_template when writing a dataset
> ----------------------------------------------------------------------------------
>
>                 Key: ARROW-10695
>                 URL: https://issues.apache.org/jira/browse/ARROW-10695
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Joris Van den Bossche
>            Priority: Major
>              Labels: dataset, dataset-parquet-write
>             Fix For: 3.0.0
>
>
> Currently we allow the user to specify a {{basename_template}}, and this can include a {{"\{i\}"}} part to replace it with an automatically incremented integer (so each generated file written to a single partition is unique):
> https://github.com/apache/arrow/blob/master/python/pyarrow/dataset.py#L713-L717
> It _might_ be useful to also have the ability to use a UUID, to ensure the file is unique in general (not only for a single write) and to mimic the behaviour of the old {{write_to_dataset}} implementation.
> For example, we could look for a {{"\{uuid\}"}} in the template string, and if present replace it for each file with a new UUID.



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