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From Jan Høydahl (JIRA) <j...@apache.org>
Subject [jira] [Commented] (SOLR-2366) Facet Range Gaps
Date Mon, 29 Aug 2011 16:26:38 GMT

    [ https://issues.apache.org/jira/browse/SOLR-2366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13092956#comment-13092956
] 

Jan Høydahl commented on SOLR-2366:
-----------------------------------

I've attempted a possible documentation of the facet.range.spec param as I envision it, at
http://wiki.apache.org/solr/VariableRangeGaps

> Facet Range Gaps
> ----------------
>
>                 Key: SOLR-2366
>                 URL: https://issues.apache.org/jira/browse/SOLR-2366
>             Project: Solr
>          Issue Type: Improvement
>            Reporter: Grant Ingersoll
>            Priority: Minor
>             Fix For: 3.4, 4.0
>
>         Attachments: SOLR-2366.patch, SOLR-2366.patch
>
>
> There really is no reason why the range gap for date and numeric faceting needs to be
evenly spaced.  For instance, if and when SOLR-1581 is completed and one were doing spatial
distance calculations, one could facet by function into 3 different sized buckets: walking
distance (0-5KM), driving distance (5KM-150KM) and everything else (150KM+), for instance.
 We should be able to quantize the results into arbitrarily sized buckets.  I'd propose the
syntax to be a comma separated list of sizes for each bucket.  If only one value is specified,
then it behaves as it currently does.  Otherwise, it creates the different size buckets. 
If the number of buckets doesn't evenly divide up the space, then the size of the last bucket
specified is used to fill out the remaining space (not sure on this)
> For instance,
> facet.range.start=0
> facet.range.end=400
> facet.range.gap=5,25,50,100
> would yield buckets of:
> 0-5,5-30,30-80,80-180,180-280,280-380,380-400

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