[jira] [Commented] (ARROW-15455) [C++] Cast between fixed size list type and variable size list

["Apache Arrow JIRA Bot (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/ARROW-15455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17617895#comment-17617895 ] 

Apache Arrow JIRA Bot commented on ARROW-15455:
-----------------------------------------------

This issue was last updated over 90 days ago, which may be an indication it is no longer being actively worked. To better reflect the current state, the issue is being unassigned per [project policy|https://arrow.apache.org/docs/dev/developers/bug_reports.html#issue-assignment]. Please feel free to re-take assignment of the issue if it is being actively worked, or if you plan to start that work soon.

> [C++] Cast between fixed size list type and variable size list 
> ---------------------------------------------------------------
>
>                 Key: ARROW-15455
>                 URL: https://issues.apache.org/jira/browse/ARROW-15455
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Joris Van den Bossche
>            Assignee: Jabari Booker
>            Priority: Major
>              Labels: good-second-issue, kernel, pull-request-available
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> Casting from fixed size list to variable size list could be possible, I think, but currently doesn't work:
> {code:python}
> >>> fixed_size = pa.array([[1, 2], [3, 4]], type=pa.list_(pa.int64(), 2))
> >>> fixed_size.cast(pa.list_(pa.int64()))
> ...
> ArrowNotImplementedError: Unsupported cast from fixed_size_list<item: int64>[2] to list using function cast_list
> {code}
> And in principle, a cast the other way around could also be possible if it is checked that each list has the correct length.



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