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https://issues.apache.org/jira/browse/SOLR-2366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13000293#comment-13000293
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Herman J Kiefus commented on SOLR-2366:
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Also regarding arbitrary ranges:
While using fact.query allows us to construct arbitrary ranges, we must then
pick them out of the results separately. This becomes more difficult if we
arbitrarily facet on two or more fields/expressions. Essentially we have to
parse the results, grouping by expression and then picking out each range in
the order we want to illustrate it. This would seem to be unnecessary, if we
had the ability to add n absolute ranges to a facet.range.
> 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, 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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