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Posted to dev@arrow.apache.org by "David Li (Jira)" <ji...@apache.org> on 2020/05/01 17:31:00 UTC

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

David Li created ARROW-8665:
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             Summary: [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


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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