[jira] [Created] (SOLR-7306) Add percentiles to Facet Module

["Yonik Seeley (JIRA)" <ji...@apache.org>]

Yonik Seeley created SOLR-7306:
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             Summary: Add percentiles to Facet Module
                 Key: SOLR-7306
                 URL: https://issues.apache.org/jira/browse/SOLR-7306
             Project: Solr
          Issue Type: New Feature
            Reporter: Yonik Seeley


Use Ted Dunnings t-digest to add distributed percentile support to the new Facet Module (aka "JSON Facets").
{code}
// single percentile over complete doc set
json.facet={ median : 'percentile(my_field,50)' }

// calculate multiple percentiles of a function
json.facet={multi:'percentile( mul(f1,f2), 1,10,50,90,99)' }

// calculate the median of each facet bucket and sort by that value
json.facet={categories:{terms:{
  field:cat ,
  sort:'median desc' ,
  facet : {
    median : 'percentile(myfield,50)' ,
    otherstat : 'sum(something_else)'
  }
}}}
{code}



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