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https://issues.apache.org/jira/browse/SOLR-2366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12995585#comment-12995585
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Hoss Man commented on SOLR-2366:
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the use case of facet.range (and facet.date before it) was always about having
ranges generated for you automatcly using a fixed gap size. if you want
variable gap sizes, it's just as easy to specify them using facet.query.
i don't really understand how your proposal adds value over using facet.query
for the ranges you want to have specific widths, and then using facet.range for
the rest of the ranges you want generated automaticly with a specific gap.
it just seems like a more confusing way of expressing the same thing
> 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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