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https://issues.apache.org/jira/browse/ARROW-4975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17448225#comment-17448225
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Antoine Pitrou commented on ARROW-4975:
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This should be almost trivial for sparse unions and would require a bit more
care for dense unions.
> [C++] Support concatenation of UnionArrays
> ------------------------------------------
>
> Key: ARROW-4975
> URL: https://issues.apache.org/jira/browse/ARROW-4975
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Ben Kietzman
> Priority: Minor
> Labels: good-first-issue, good-second-issue
> Fix For: 7.0.0
>
>
> https://github.com/apache/arrow/pull/3746 adds support for concatenation of
> arrays, but UnionArrays are not supported.
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