[jira] [Resolved] (ARROW-10207) [C++] Unary kernels that results in a list have no preallocated offset buffer

["Ben Kietzman (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-10207?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ben Kietzman resolved ARROW-10207.
----------------------------------
    Resolution: Fixed

Issue resolved by pull request 8498
[https://github.com/apache/arrow/pull/8498]

> [C++] Unary kernels that results in a list have no preallocated offset buffer
> -----------------------------------------------------------------------------
>
>                 Key: ARROW-10207
>                 URL: https://issues.apache.org/jira/browse/ARROW-10207
>             Project: Apache Arrow
>          Issue Type: Improvement
>          Components: C++
>            Reporter: Maarten Breddels
>            Assignee: Antoine Pitrou
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 3.0.0
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> I noticed in
> [https://github.com/apache/arrow/pull/8271]
> That a string->list[string] kernel does not have the offsets preallocated in the output. I believe there is a preference for not doing allocations in kernels, so this can be optimized at a higher level. I think it can also be done in this case. 



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