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https://issues.apache.org/jira/browse/ARROW-8494?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved ARROW-8494.
-----------------------------------
Fix Version/s: 2.0.0
Resolution: Fixed
Issue resolved by pull request 8177
[https://github.com/apache/arrow/pull/8177]
> [C++] Implement basic array-by-array reassembly logic
> ------------------------------------------------------
>
> Key: ARROW-8494
> URL: https://issues.apache.org/jira/browse/ARROW-8494
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: C++
> Reporter: Micah Kornfield
> Assignee: Micah Kornfield
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.0.0
>
> Time Spent: 8h 40m
> Remaining Estimate: 0h
>
> This logic would attempt to create the data necessary for each field by
> passing through the levels once for each field. it is expected that due to
> once we can put SIMD/bitmap code in place this will perform better for nested
> data with shallow nesting, but due to repetitive computation might perform
> worse for deep nested that include List-types. The SIMD/bitmap enhancements
> are covered in: ARROW-9985
>
> At a high level the logic would be structured as:
> {{for each field:}}
> {{ for each rep/def level entry:}}
> {{ update null bitmask and offsets.}}
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