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https://issues.apache.org/jira/browse/ARROW-9222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney resolved ARROW-9222.
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Resolution: Fixed
Issue resolved by pull request 7535
[https://github.com/apache/arrow/pull/7535]
> [Format][Proposal] Remove validity bitmap from Union types
> ----------------------------------------------------------
>
> Key: ARROW-9222
> URL: https://issues.apache.org/jira/browse/ARROW-9222
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Format
> Reporter: Wes McKinney
> Assignee: Wes McKinney
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.0.0
>
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> See mailing list discussion
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