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https://issues.apache.org/jira/browse/ARROW-6940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17066259#comment-17066259
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Wes McKinney commented on ARROW-6940:
-------------------------------------
I was wrong, there is more work to do to enable metadata to be supplied when
writing a message into a stream writer or file writer. Will require a follow up
patch. Something for after 0.17.0
> [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
> Assignee: Wes McKinney
> Priority: Major
> Fix For: 0.17.0
>
>
> 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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