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https://issues.apache.org/jira/browse/ARROW-17480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Li resolved ARROW-17480.
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Fix Version/s: 10.0.0
Resolution: Fixed
Issue resolved by pull request 14244
[https://github.com/apache/arrow/pull/14244]
> [Java] add setNull() to FieldVector interface
> ---------------------------------------------
>
> Key: ARROW-17480
> URL: https://issues.apache.org/jira/browse/ARROW-17480
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Affects Versions: 9.0.0
> Reporter: Larry White
> Assignee: Larry White
> Priority: Major
> Labels: Java, pull-request-available
> Fix For: 10.0.0
>
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> Only three FieldVector types do not implement setNull(): UnionVector,
> DenseUnionVector and NullVector, preventing it from being addable to the
> ValueVector interface and thus requiring a cast when used.
> For all three vector types it could be added as a no-op. For NullVector, all
> values are already null. For the other two, null values are not supported at
> the top level, but only in the individual child vectors. A no-op
> implementation is not only consistent with the existing writeNull()
> operations in the Union and DenseUnion Writer classes, but it is consistent
> with isNull(), which always returns false.
> An implementation is also needed in the abstract ExtensionTypeVector, which
> can delegate to the underlying vector object.
> See also a similar issue opened for FieldWriter (ARROW-2538), which may be
> closable given the current code base.
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