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Posted to issues@arrow.apache.org by "Jacques Nadeau (JIRA)" <ji...@apache.org> on 2019/07/02 23:01:00 UTC

[jira] [Commented] (ARROW-5821) [Java] Support compact fixed-width vectors

    [ https://issues.apache.org/jira/browse/ARROW-5821?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16877350#comment-16877350 ] 

Jacques Nadeau commented on ARROW-5821:
---------------------------------------

If I understand the ask correctly, it seems like you are proposing to change the format to have a new integer representation that doesn't support constant lookup. I'm not sure now is the right time to do something like this.

> [Java] Support compact fixed-width vectors
> ------------------------------------------
>
>                 Key: ARROW-5821
>                 URL: https://issues.apache.org/jira/browse/ARROW-5821
>             Project: Apache Arrow
>          Issue Type: New Feature
>            Reporter: Ji Liu
>            Assignee: Ji Liu
>            Priority: Minor
>
> In shuffle stage of some applications, FixedWitdhVectors may have very little non-null data.
> In this case, directly serialize vectors is not a good choice, generally we can compact the vector make it only holding non-null value and create a BitVector to trace the indices for non-null values so that it could be deserialized properly.



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