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https://issues.apache.org/jira/browse/SOLR-2366?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13101204#comment-13101204
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Jan Høydahl commented on SOLR-2366:
-----------------------------------
One thing this improvement needs to tackle is how to return the range buckets
in the Response. It will not be enough with the simple range_facet format
{code:xml}
<lst name="facet_ranges">
<lst name="url_length">
<lst name="counts">
<int name="42">1</int>
<int name="45">1</int>
<int name="51">1</int>
<int name="66">1</int>
</lst>
<int name="gap">3</int>
<int name="start">0</int>
<int name="end">102</int>
</lst>
</lst>
{code}
We need something which can return the explicit ranges, similar to what
facet_queries has. This format can then be used for the old plain gap format as
well.
{code:xml}
<lst name="facet_ranges">
<lst name="url_length">
<lst name="counts">
<int name="[42 TO 45}">1</int>
<int name="[45 TO 48}">1</int>
<int name="[51 TO 54}">1</int>
<int name="[66 TO 69}">1</int>
</lst>
<int name="gap">3</int>
<int name="start">0</int>
<int name="end">102</int>
</lst>
<lst name="bedrooms">
<lst name="counts">
<int name="[1 TO *]">12</int>
<int name="[2 TO *]">31</int>
<int name="[3 TO *]">26</int>
<int name="[4 TO *]">9</int>
</lst>
<int name="spec">1..*,2..*,3..*,4..*</int>
<int name="include">all</int>
</lst>
</lst>
{code}
> 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.
> (Original syntax proposal removed, see discussion for concrete syntax)
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