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https://issues.apache.org/jira/browse/ARROW-33?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15852689#comment-15852689
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Uwe L. Korn commented on ARROW-33:
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We should not need to make {{null_count}} virtual as the handling of valid
bitmaps is the same for all arrays. Just checking in the main implementation if
it is {{<0}} and then recompute should be enough. Given that we use the
{{null_count}} mostly for checking if the number of nulls is 0, and if not we
go into the more expensive code path, I think the solution to compute on first
{{null_count()}} is the most reasonable.
> C++: Implement zero-copy array slicing
> --------------------------------------
>
> Key: ARROW-33
> URL: https://issues.apache.org/jira/browse/ARROW-33
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
>
> Sliced array results will retain a reference to the parent's data buffer
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