I believe you're talking about Fieldcollapsing. It's available as a patch, although I'm not sure how well it applies to the current trunk.
for more info check out: http://wiki.apache.org/solr/FieldCollapsing <http://wiki.apache.org/solr/FieldCollapsing>Geert-Jan 2010/4/13 Felix Zimmermann <feliz...@gmx.de> > Hi, > > for a preview of results, I need to display up to 3 documents per > category. Is it possible to limit the number of rows of solr response by > field-values? What I mean is: > > rows: 9 > -(sub)rows of "field:cat1" : 3 > -(sub)rows of "field:cat2" : 3 > -(sub)rows of "field:cat3" : 3 > > If not, is there a workaround or do I have to send three queries? > > Thanks! > felix > >