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https://issues.apache.org/jira/browse/ARROW-6940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17286014#comment-17286014
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David Li commented on ARROW-6940:
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Flight has a separate custom ("application") metadata field that was added
before this was implemented. I don't think it's needed for Flight but I do
think we need to take a second look at compression + Flight.
> [C++] Expose Message-level IPC metadata in both read and write interfaces
> -------------------------------------------------------------------------
>
> Key: ARROW-6940
> URL: https://issues.apache.org/jira/browse/ARROW-6940
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 4.0.0
>
>
> the Message flatbuffer type has {{custom_metadata}} but there is no API
> support for reading and writing values to this field.
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