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https://issues.apache.org/jira/browse/ARROW-2969?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16713108#comment-16713108
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Wes McKinney commented on ARROW-2969:
-------------------------------------
The fields of a StructArray are independent arrays. The only additional memory
is a validity bitmap to indicate whether a struct "slot" is null or not
> [R] Convert between StructArray and "nested" data.frame column containing
> data frame in each cell
> -------------------------------------------------------------------------------------------------
>
> Key: ARROW-2969
> URL: https://issues.apache.org/jira/browse/ARROW-2969
> Project: Apache Arrow
> Issue Type: New Feature
> Components: R
> Reporter: Wes McKinney
> Priority: Major
>
> These are starting to be more widely used with the tidyr package and
> elsewhere cc [~hadley]
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