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https://issues.apache.org/jira/browse/ARROW-6212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Micah Kornfield resolved ARROW-6212.
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Resolution: Fixed
Fix Version/s: 0.15.0
Issue resolved by pull request 5066
[https://github.com/apache/arrow/pull/5066]
> [Java] Support vector rank operation
> ------------------------------------
>
> Key: ARROW-6212
> URL: https://issues.apache.org/jira/browse/ARROW-6212
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Java
> Reporter: Liya Fan
> Assignee: Liya Fan
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.15.0
>
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> Given an unsorted vector, we want to get the index of the ith smallest
> element in the vector. This function is supported by the rank operation.
> We provide an implementation that gets the index with the desired rank,
> without sorting the vector (the vector is left intact), and the
> implementation takes O( n ) time, where n is the vector length.
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