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https://issues.apache.org/jira/browse/LUCENE-7927?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless reopened LUCENE-7927:
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> 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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