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https://issues.apache.org/jira/browse/ARROW-6352?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16917545#comment-16917545
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Micah Kornfield commented on ARROW-6352:
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[~fan_li_ya] https://issues.apache.org/jira/browse/ARROW-1692?filter=-1 is the
one for sparse.
> [Java] Add implementation of DenseUnionVector.
> ----------------------------------------------
>
> Key: ARROW-6352
> URL: https://issues.apache.org/jira/browse/ARROW-6352
> Project: Apache Arrow
> Issue Type: Improvement
> Reporter: Micah Kornfield
> Priority: Major
>
> Today only Sparse unions are supported. We should have a dense union
> implementation vector that conforms to the IPC protocol (the current sparse
> union vector doesn't do this and there are other JIRAs covering making it
> compatible).
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