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https://issues.apache.org/jira/browse/LUCENE-7889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alan Woodward updated LUCENE-7889:
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    Attachment: LUCENE-7889.patch

Here's a patch.  Still needs some javadocs.

The tests for this are pretty basic currently.  I'm going to try porting the 
randomized tests from TestGrouping to this, and make it easier to test new 
GroupSelectors, but I'll make that a separate issue.

> Allow grouping on DoubleValuesSource ranges
> -------------------------------------------
>
>                 Key: LUCENE-7889
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7889
>             Project: Lucene - Core
>          Issue Type: New Feature
>    Affects Versions: master (7.0)
>            Reporter: Alan Woodward
>            Assignee: Alan Woodward
>         Attachments: LUCENE-7889.patch
>
>
> LUCENE-7701 made it easier to define new ways of grouping results.  This 
> issue adds functionality to group the values of a DoubleValuesSource into a 
> set of ranges.



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