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https://issues.apache.org/jira/browse/ARROW-8665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17098907#comment-17098907
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David Li commented on ARROW-8665:
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No worries! I ran into this while trying to find a way to get the validity
buffer to be resized when trying to work around ARROW-8666. But thanks to your
suggestion there I should be set for our use case.
> [Java] DenseUnionWriter#setPosition fails with NullPointerException
> -------------------------------------------------------------------
>
> Key: ARROW-8665
> URL: https://issues.apache.org/jira/browse/ARROW-8665
> Project: Apache Arrow
> Issue Type: Bug
> Components: Java
> Affects Versions: 0.17.0
> Reporter: David Li
> Assignee: Liya Fan
> Priority: Major
>
> The writer always iterates through all BaseWriters, and an array of 128
> BaseWriters is allocated. So if you do not have 128 typeIds and do not touch
> all of them, setPosition will give you an exception.
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