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The following page has been changed by YonikSeeley:
http://wiki.apache.org/solr/SimpleFacetParameters

The comment on the change is:
document new facet.method param

------------------------------------------------------------------------------
  This parameter can be specified on a per field basis.
  
  <!> ["Solr1.2"]
+ 
+ == facet.method ==
+ 
+ This parameter indicates what type of algorithm/method to use when faceting a 
field.
+ 
+ The {{{enum}}} method was the default (and only) method prior to Solr1.4.  It 
enumerates all terms in a field, calculating the set intersection of documents 
that match the term with documents that match the query.
+ 
+ The {{{fc}}} method is the default in Solr1.4 since it tends to use less 
memory and is faster when a multi-valued field has many unique terms in the 
index.  The field is un-inverted and cached, much like the Lucene !FieldCache 
used to sort query results.  The facet counts are calculated by iterating over 
documents that match the query and summing the terms that appear in each 
document.
+ 
+ The default value is {{{fc}}}
+ 
+ <!> ["Solr1.4"]
  
  == Date Faceting Parameters ==
  

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