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https://issues.apache.org/jira/browse/ARROW-11647?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eduardo Ponce reassigned ARROW-11647:
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Assignee: Eduardo Ponce (was: Ben Kietzman)
> [C++][Compute] CastFromNull does not use preallocated buffers
> -------------------------------------------------------------
>
> Key: ARROW-11647
> URL: https://issues.apache.org/jira/browse/ARROW-11647
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Ben Kietzman
> Assignee: Eduardo Ponce
> Priority: Minor
> Fix For: 6.0.0
>
>
> When casting from null, currently new buffers are allocated for every batch
> of the computation. This is wasteful as for simple types data buffers are
> preallocated and the null bitmap is handled separately; CastFromNull need do
> no work at all (unless we decide to explicitly zero the data buffer). For
> varlength out types the offsets buffer is preallocated and should be zeroed,
> for struct types preallocation is not implemented (but should be as simple as
> preallocating each child array).
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