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https://issues.apache.org/jira/browse/ARROW-4390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17114428#comment-17114428
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Neal Richardson commented on ARROW-4390:
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After exploring more, I don't think this requires an extension type, we just
need to collect R attributes and store them as schema metadata.
> [R] Serialize "labeled" metadata in Feather files, IPC messages
> ---------------------------------------------------------------
>
> Key: ARROW-4390
> URL: https://issues.apache.org/jira/browse/ARROW-4390
> Project: Apache Arrow
> Issue Type: Improvement
> Components: R
> Reporter: Wes McKinney
> Priority: Major
>
> see https://github.com/apache/arrow/issues/3480
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