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https://issues.apache.org/jira/browse/ARROW-13076?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Li resolved ARROW-13076.
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Fix Version/s: 5.0.0
Resolution: Fixed
Issue resolved by pull request 10607
[https://github.com/apache/arrow/pull/10607]
> [Java] Enable ExtensionType to use StructVector and UnionVector for
> underlying storage
> --------------------------------------------------------------------------------------
>
> Key: ARROW-13076
> URL: https://issues.apache.org/jira/browse/ARROW-13076
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Reporter: Bryan Cutler
> Assignee: Bryan Cutler
> Priority: Major
> Labels: pull-request-available
> Fix For: 5.0.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Currently, an ExtensionTypeVector has a type constraint for the underlying
> storage to extend BaseValueVector. StructVector, UnionVector and
> DenseUnionVector do not extend this base class.
> After ARROW-13044, Union vectors will extend the ValueVector interface and
> the extension vector type constrain could be relaxed to this interface to
> allow the above vector types to be used.
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