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https://issues.apache.org/jira/browse/LUCENE-7927?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16148770#comment-16148770
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ASF subversion and git services commented on LUCENE-7927:
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Commit aa5dac04bdb5f49b75b95763e9b08065c47b8e52 in lucene-solr's branch 
refs/heads/master from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=aa5dac0 ]

LUCENE-7927: re-enable the low value optimization


> Add facets impl to count unique numeric values
> ----------------------------------------------
>
>                 Key: LUCENE-7927
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7927
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: master (8.0), 7.1
>
>         Attachments: LUCENE-7927.patch, LUCENE-7927.patch, LUCENE-7927.patch
>
>
> The facets module has multiple facet methods for counting flat and 
> hierarchical fields, and also a method for counting numeric ranges.  I'd like 
> to also add a method that counts unique numeric (long) values, designed to be 
> used for fields that have only a few, typically low valued, numbers across 
> the index e.g. a "review" rating from 1 to 5.



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