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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.
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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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