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https://issues.apache.org/jira/browse/SOLR-2366?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Grant Ingersoll updated SOLR-2366:
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    Attachment: SOLR-2366.patch

Adds variable width gap capabilities and some tests.  Still needs some more 
tests for edge conditions, etc. but it is something that others can look at and 
comment on.

> 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: 3.2, 4.0
>
>         Attachments: 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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