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https://issues.apache.org/jira/browse/ARROW-6911?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Micah Kornfield resolved ARROW-6911.
------------------------------------
    Fix Version/s: 1.0.0
       Resolution: Fixed

Issue resolved by pull request 5678
[https://github.com/apache/arrow/pull/5678]

> [Java] Provide composite comparator
> -----------------------------------
>
>                 Key: ARROW-6911
>                 URL: https://issues.apache.org/jira/browse/ARROW-6911
>             Project: Apache Arrow
>          Issue Type: New Feature
>          Components: Java
>            Reporter: Liya Fan
>            Assignee: Liya Fan
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.0.0
>
>          Time Spent: 50m
>  Remaining Estimate: 0h
>
> A composite comparator is a sub-class of VectorValueComparator that contains 
> an array of inner comparators, with each comparator corresponding to one 
> column for comparison. It can be used to support sort/comparison operations 
> for VectorSchemaRoot/StructVector.
> The composite comparator works like this: it first uses the first internal 
> comparator (for the primary sort key) to compare vector values. If it gets a 
> non-zero value, we just return it; otherwise, we use the second comparator to 
> break the tie, and so on, until a non-zero value is produced by some internal 
> comparator, or all internal comparators have been used. 



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