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https://issues.apache.org/jira/browse/ARROW-380?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17657414#comment-17657414
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Rok Mihevc commented on ARROW-380:
----------------------------------

This issue has been migrated to [issue 
#15332|https://github.com/apache/arrow/issues/15332] on GitHub. Please see the 
[migration documentation|https://github.com/apache/arrow/issues/14542] for 
further details.

> [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
>            Reporter: Julien Le Dem
>            Assignee: Mohamed Zenadi
>            Priority: Major
>              Labels: newbie
>             Fix For: 0.2.0
>
>
> 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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