Apache Solr Reference Guide Covering Apache Solr 6.0

her. In addition to the all option, this parameter can be specified multiple times to indicate multiple choices,
but none will override all other options.
The facet.range.method Parameter
The facet.range.method parameter selects the type of algorithm or method Solr should use for range
faceting. Both methods produce the same results, but performance may vary.
Method
filter
dv
Description
This method generates the ranges based on other facet.range parameters, and for each of them
executes a filter that later intersects with the main query resultset to get the count. It will make
use of the filterCache, so it will benefit of a cache large enough to contain all ranges.
This method iterates the documents that match the main query, and for each of them finds the
correct range for the value. This method will make use of docValues (if enabled for the field) or
fieldCache. "dv" method is not supported for field type DateRangeField or when using group.fac
ets.
Default value for this parameter is "filter".
The facet.mincount Parameter in Range Faceting
The facet.mincount parameter, the same one as used in field faceting is also applied to range faceting.
When used, no ranges with a count below the minimum will be included in the response.
Date Ranges & Time Zones
Range faceting on date fields is a common situation where the TZ parameter can be useful to ensure
that the "facet counts per day" or "facet counts per month" are based on a meaningful definition of
when a given day/month "starts" relative to a particular TimeZone.
For more information, see the examples in the Working with Dates section.
Pivot (Decision Tree) Faceting
Pivoting is a summarization tool that lets you automatically sort, count, total or average data stored in a table.
The results are typically displayed in a second table showing the summarized data. Pivot faceting lets you
create a summary table of the results from a faceting documents by multiple fields.
Another way to look at it is that the query produces a Decision Tree, in that Solr tells you "for facet A, the
constraints/counts are X/N, Y/M, etc. If you were to constrain A by X, then the constraint counts for B would
be S/P, T/Q, etc.". In other words, it tells you in advance what the "next" set of facet results would be for a
field if you apply a constraint from the current facet results.
facet.pivot
The facet.pivot parameter defines the fields to use for the pivot. Multiple facet.pivot values will create
multiple "facet_pivot" sections in the response. Separate each list of fields with a comma.
facet.pivot.mincount
The facet.pivot.mincount parameter defines the minimum number of documents that need to match in
order for the facet to be included in results. The default is 1.
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