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https://issues.apache.org/jira/browse/ARROW-14379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17529089#comment-17529089
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Weston Pace commented on ARROW-14379:
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Naive question but why not use a struct array with 3 columns, {{value}},
{{attr1}}, and {{attr2}}?
> [R] Create a custom extension of list that stores row-level metadata
> --------------------------------------------------------------------
>
> Key: ARROW-14379
> URL: https://issues.apache.org/jira/browse/ARROW-14379
> Project: Apache Arrow
> Issue Type: Sub-task
> Components: R
> Reporter: Jonathan Keane
> Priority: Major
>
> Since lists can be nested, we should be able store each element as something
> like {{list(value = "foo", attributes = list(attr1 = TRUE, attr2 = "baz"))}}
> and then we can reconstitute that in the R conversion to transfer the
> attributes element to attributes.
> This will be more efficient (since we get compression on the column +
> metadata/attributes) and we also will be able to filter these + use them in
> datasets since each row has all of the information about itself that it needs
> to roundtrip.
> This would get us SF columns for free
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