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From "Grant Ingersoll (JIRA)" <j...@apache.org>
Subject [jira] Created: (SOLR-2366) Facet Range Gaps
Date Wed, 16 Feb 2011 13:33:57 GMT
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


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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