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

["Maarten Breddels (Jira)" <ji...@apache.org>]

Maarten Breddels created ARROW-10207:
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             Summary: 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
            Reporter: Maarten Breddels


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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