[jira] [Created] (SOLR-7795) Fold Interval Faceting into Range Faceting

["Tomás Fernández Löbbe (JIRA)" <ji...@apache.org>]

Tomás Fernández Löbbe created SOLR-7795:
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             Summary: Fold Interval Faceting into Range Faceting
                 Key: SOLR-7795
                 URL: https://issues.apache.org/jira/browse/SOLR-7795
             Project: Solr
          Issue Type: Task
            Reporter: Tomás Fernández Löbbe
             Fix For: 5.3, Trunk


Now that range faceting supports a "filter" and a "dv" method, and that interval faceting is supported on fields with {{docValues=false}}, I think we should make it so that interval faceting is just a different way of specifying ranges in range faceting, allowing users to indicate specific ranges.
I propose we use the same syntax for intervals, but under the "range" parameter family:
{noformat}
facet.range=price&
f.price.facet.range.set=[0,10]&
f.price.facet.range.set=(10,100]
{noformat}

The counts for those ranges would come in the response also inside of the "range_facets" section. I'm not sure if it's better to include the ranges in the "counts" section, or in a different section (intervals?sets?buckets?). I'm open to suggestions. 
{code}
"facet_ranges":{
      "price":{
        "counts":[
          "[0,10]",3,
          "(10,100]",2]
       }
}
{code}
or…
{code}
"facet_ranges":{
      "price":{
        "intervals":[
          "[0,10]",3,
          "(10,100]",2]
       }
}
{code}
We should support people specifying both things on the same field.
Once this is done, "interval faceting" could be deprecated, as all it's functionality is now possible through range queries. 



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