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The "FieldCollapsing" page has been changed by martijn. The comment on this change is: Added some defaults to parameters and added information about new response format. http://wiki.apache.org/solr/FieldCollapsing?action=diff&rev1=7&rev2=8 -------------------------------------------------- ||collapse.field ||Which field to collapse. If this field is not specified then field collapsing is not enabled and falls back to to the QueryComponent to do a search. || ||collapse.facet ||before/after -- apply faceting before or after collapsing. Defaults to after || ||collapse.max ||Deprecated use collapse.threshold instead || - ||collapse.threshold ||The number of documents with the same value for collapse.field after which collapsing kicks in || + ||collapse.threshold ||The number of documents with the same value for collapse.field after which collapsing kicks in. The default value is one. || - ||collapse.maxdocs ||Maximum number of documents to process during field collapsing || + ||collapse.maxdocs ||Maximum number of documents to process during field collapsin. This parameter defaults to one greater then the largest document number. || ||collapse.info.doc ||Return collapse count for each document? Defaults to true || ||collapse.info.count ||Return collapse count for each field value? Defaults to true || ||collapse.includeCollapsedDocs.fl ||Parameter indicating to return the collapsed documents in the response and what fields to return in comma separated manner. A value * indicates that all fields will be returned || @@ -60, +60 @@ == Examples == + The latest patch has an improved response format. The first two examples are valid for patches before 2009-11-11 and the last example is valid for patches from that date. + Using the example data: Collapse all documents using 'cat' and 'normal' collapse type: @@ -85, +87 @@ <int name="monitor">1</int> </lst> }}} + http://localhost:8983/solr/select/?q=*:*&collapse.field=cat&collapse.threshold=1&collapse.type=adjacent + + {{{ + <lst name="collapse_counts"> + <str name="field">venue</str> + <lst name="results"> + <lst name="233238"> + <str name="fieldValue">hard</str> + <int name="collapseCount">1</int> + </lst> + <lst name="244438"> + <str name="fieldValue">electronics</str> + <int name="collapseCount">1</int> + </lst> + <lst name="234658"> + <str name="fieldValue">memory</str> + <int name="collapseCount">2</int> + </lst> + <lst name="984338"> + <str name="fieldValue">monitor</str> + <int name="collapseCount">1</int> + </lst> + </lst> + </lst> + }}} + The response is now centred around collapse groups. A collapse group represents documents that were collapsed during the search. A collapse group is identifier by the most relevant document of that collapse group, which is document that did not get collapsed and remained present in the search result. So the ids like 233238 are from documents that are also present in the search result. + == Other resources == Some other resources regarding to field collapsing:
