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https://issues.apache.org/jira/browse/ARROW-9434?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Antoine Pitrou resolved ARROW-9434.
-----------------------------------
Resolution: Fixed
Issue resolved by pull request 10817
[https://github.com/apache/arrow/pull/10817]
> [C++] Store type_code information in UnionScalar::value
> -------------------------------------------------------
>
> Key: ARROW-9434
> URL: https://issues.apache.org/jira/browse/ARROW-9434
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Krisztian Szucs
> Assignee: Antoine Pitrou
> Priority: Major
> Labels: pull-request-available
> Fix For: 6.0.0
>
> Time Spent: 3h 40m
> Remaining Estimate: 0h
>
> The format allows duplicated types in unions, so in order to properly
> construct an array from a unionscalar we need to know which type to use.
> Currently we only store the value as another scalar.
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