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https://issues.apache.org/jira/browse/ARROW-9304?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17219015#comment-17219015
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Antoine Pitrou commented on ARROW-9304:
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This is also worthwhile doing on union arrays (especially sparse).
> [C++] Add "AppendEmptyValue" builder APIs for use inside
> StructBuilder::AppendNull
> ----------------------------------------------------------------------------------
>
> Key: ARROW-9304
> URL: https://issues.apache.org/jira/browse/ARROW-9304
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Assignee: Ji Liu
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.0.0
>
> Time Spent: 6h 50m
> Remaining Estimate: 0h
>
> StructBuilder should probably also add "UnsafeAppendNull" so that there is
> the option of using the Unsafe* operations on the children
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