[jira] [Commented] (ARROW-10440) [C++][Dataset][Python] Add a callback to visit file writers just before Finish()

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

    [ https://issues.apache.org/jira/browse/ARROW-10440?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17320199#comment-17320199 ] 

Joris Van den Bossche commented on ARROW-10440:
-----------------------------------------------

([~ldacey] since I asked you on the other issue about creating new issues: this one actually already covers the {{metadata_collector}} question, I think?)

I suppose a generic callback could indeed solve your use case. But on the other hand: getting the file names of the files that were just written also seems like a generally useful thing we could maybe expose in some other way without needing the generic callback?

[~bkietz] did you envision this also to be exposed in Python? 

> [C++][Dataset][Python] Add a callback to visit file writers just before Finish()
> --------------------------------------------------------------------------------
>
>                 Key: ARROW-10440
>                 URL: https://issues.apache.org/jira/browse/ARROW-10440
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>    Affects Versions: 2.0.0
>            Reporter: Ben Kietzman
>            Assignee: Ben Kietzman
>            Priority: Major
>             Fix For: 5.0.0
>
>
> This will fill the role of (for example) {{metadata_collector}} or allow stats to be embedded in IPC file footer metadata.



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