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From Apache Wiki <>
Subject [Solr Wiki] Update of "FieldCollapsing" by martijnvg
Date Wed, 14 Mar 2012 12:10:25 GMT
Dear Wiki user,

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The "FieldCollapsing" page has been changed by martijnvg:

Added group.facet parameter documentation.

  ||group.main||true/false||If true, the result of the last field grouping command is used
as the main result list in the response, using group.format=simple||
  ||group.ngroups||true/false||If true, includes the number of groups that have matched the
query. Default is false.||
  ||group.truncate||true/false||If true, facet counts are based on the most relevant document
of each group matching the query. Same applies for StatsComponent. Default is false. <!>
[[Solr3.4]] Supported from Solr 3.4 and up.||
+ ||group.facet||true/false||Whether to compute grouped facets for the field facets specified
in {{facet.field}} parameters. Grouped facets are computed based on the first specified group.
Just like normal field faceting, fields shouldn't be tokenized (otherwise counts are computed
for each token). Grouped faceting supports single and multivalued fields. Default is false.
<!> [[Solr4.0]] This parameter only is supported on 4.0||
  ||group.cache.percent||[0-100]||If > 0 enables grouping cache. Grouping is executed actual
two searches. This option caches the second search. A value of 0 disables grouping caching.
Default is 0. Tests have shown that this cache only improves search time with boolean queries,
wildcard queries and fuzzy queries. For simple queries like a term query or a match all query
this cache has a negative impact on performance||

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