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https://issues.apache.org/jira/browse/SOLR-2366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13101185#comment-13101185
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Jan Høydahl commented on SOLR-2366:
-----------------------------------
I've given the Wiki page another take, with the new proposed start/end syntax
and added an example or two. The "mutually exclusive" sentence now boils down
to facet.range.gap/facet.range.spec being mutually exclusive (one the same
field). Have a look at
http://wiki.apache.org/solr/VariableRangeGaps#facet.range.spec
> 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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