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https://issues.apache.org/jira/browse/ARROW-246?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15402958#comment-15402958
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Deneche A. Hakim commented on ARROW-246:
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created pull request [#110|https://github.com/apache/arrow/pull/110]
> [Java] UnionVector doesn't call allocateNew() when creating it's vectorType
> ---------------------------------------------------------------------------
>
> Key: ARROW-246
> URL: https://issues.apache.org/jira/browse/ARROW-246
> Project: Apache Arrow
> Issue Type: Bug
> Components: Java - Vectors
> Reporter: Deneche A. Hakim
> Assignee: Deneche A. Hakim
>
> UnionVector uses a UINT1Vector to store the types of every value in the
> vector., but it doesn't call allocateNew() on that vector and more
> importantly zeroVector(). When we call setSafe() the 1st time (e.g. from
> PromotableVector.promoteToUnion()) it will re-allocate the vector but will
> fail to properly set it's content to 0. This can cause various failures when
> we try to access the value/type stored in the vector.
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