Micah Kornfield resolved ARROW-6212.
       Resolution: Fixed
    Fix Version/s: 0.15.0

Issue resolved by pull request 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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