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https://issues.apache.org/jira/browse/ARROW-9265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17152132#comment-17152132
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Antoine Pitrou commented on ARROW-9265:
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Unions should not be allowed when writing v4 data, and probably not when
reading either (unless we implement the required compatibility code).
> [C++] Add support for writing MetadataVersion::V4-compatible IPC messages for
> compatibility with library versions <= 0.17.1
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: ARROW-9265
> URL: https://issues.apache.org/jira/browse/ARROW-9265
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Fix For: 1.0.0
>
>
> While we need to increment the MetadataVersion, we should not strand old
> library versions since V4 is backward compatible with V5.
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