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https://issues.apache.org/jira/browse/ARROW-380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15674169#comment-15674169
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Julien Le Dem commented on ARROW-380:
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[~zeapo] yes.
possibly getNullCount() ?
> [Java] optimize null count when serializing vectors.
> ----------------------------------------------------
>
> Key: ARROW-380
> URL: https://issues.apache.org/jira/browse/ARROW-380
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java - Vectors
> Reporter: Julien Le Dem
> Labels: newbie
>
> nulls are stored in bits. We should be able to use more efficient ways to
> count nulls:
> https://github.com/apache/arrow/blob/6996c17f70dc13659c37dfaa39bc28e7777ca6a6/java/vector/src/main/java/org/apache/arrow/vector/VectorUnloader.java#L68
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