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Posted to issues@arrow.apache.org by "Liya Fan (Jira)" <ji...@apache.org> on 2020/05/03 02:44:00 UTC

[jira] [Commented] (ARROW-8665) [Java] DenseUnionWriter#setPosition fails with NullPointerException

    [ https://issues.apache.org/jira/browse/ARROW-8665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17098187#comment-17098187 ] 

Liya Fan commented on ARROW-8665:
---------------------------------

[~lidavidm] Sorry for the problem. I will provide a patch for it. 

> [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
>            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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