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https://issues.apache.org/jira/browse/ARROW-4119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17661142#comment-17661142
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Rok Mihevc commented on ARROW-4119:
-----------------------------------
This issue has been migrated to [issue
#20709|https://github.com/apache/arrow/issues/20709] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [C++] Clean up cast implementation from null to other types
> -----------------------------------------------------------
>
> Key: ARROW-4119
> URL: https://issues.apache.org/jira/browse/ARROW-4119
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
>
> We are currently generating a bunch of empty kernels when there is no need.
> It would be better to define a clean {{NullCastKernel}} that handles ensuring
> that appropriate buffers have been constructed for the output all-null array
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