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https://issues.apache.org/jira/browse/ARROW-13570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alessandro Molina updated ARROW-13570:
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Fix Version/s: (was: 6.0.0)
7.0.0
> [C++][Compute] Additional scalar ASCII kernels can reuse original offsets
> buffer
> --------------------------------------------------------------------------------
>
> Key: ARROW-13570
> URL: https://issues.apache.org/jira/browse/ARROW-13570
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Eduardo Ponce
> Priority: Major
> Fix For: 7.0.0
>
>
> Some ASCII scalar string kernels are able to reuse the original offsets
> buffer, so they are not preallocated in the output (use
> *MemAllocation::NO_PREALLOCATE* during registration). Currently, only kernels
> that apply a transformation to each character independently via
> [StringDataTransform|https://github.com/apache/arrow/blob/master/cpp/src/arrow/compute/kernels/scalar_string.cc#L590-L631]
> support the no preallocation policy. But there are additional string kernels
> that do not modify the length (nor offsets) of the input string but apply
> scalar transforms that depend on neighboring characters.
> This issue should extend/create *StringDataTransform* to take multiple input
> transforms in order to support *MemAllocation::NO_PREALLOCATE* policy for
> additional scalar ASCII kernels (e.g., _ascii_title_).
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