[jira] [Assigned] (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:all-tabpanel ]

Apache Arrow JIRA Bot reassigned ARROW-15455:
---------------------------------------------

    Assignee:     (was: Jabari Booker)

> [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
>            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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