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

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

     [ https://issues.apache.org/jira/browse/SOLR-7306?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yonik Seeley updated SOLR-7306:
-------------------------------
    Attachment: SOLR-7306.patch

Here's a patch, it was simpler than I thought to add support.

As a testament to the pluggability / flexibility of the new faceting module, this is something that an end user could have done with a plugin - no need to modify Solr source files.

> 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
>         Attachments: SOLR-7306.patch
>
>
> 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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