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From "Michael McCandless (JIRA)" <>
Subject [jira] [Updated] (LUCENE-7927) Add facets impl to count unique numeric values
Date Thu, 17 Aug 2017 09:50:00 GMT


Michael McCandless updated LUCENE-7927:
    Attachment: LUCENE-7927.patch

Another iteration, borrowing the nice native {{long -> int}} hash table from Solr's {{NumericFacets}},
and also adding specialized implementations for counting all facets and for the multi-valued

It would be nice to also support float/double but I think that should be a separate issue.

Next up l'll make a benchmark to test whether the small value optimization (using a simple
array to count values 0 - 1023) is worthwhile ... it could be the hash table is fast enough.

> Add facets impl to count unique numeric values
> ----------------------------------------------
>                 Key: LUCENE-7927
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/facet
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 7.1
>         Attachments: 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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