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Posted to solr-commits@lucene.apache.org by Apache Wiki <wi...@apache.org> on 2009/06/19 13:35:59 UTC
[Solr Wiki] Update of "SolrRelevancyFAQ" by ShalinMangar
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The following page has been changed by ShalinMangar:
http://wiki.apache.org/solr/SolrRelevancyFAQ
The comment on the change is:
Added note on giving low boosts
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Use something of the form recip(rord(myfield),1,1000,1000)
http://lucene.apache.org/solr/api/org/apache/solr/search/function/ReciprocalFloatFunction.html
+ == How do I give a very low boost to documents that match my query ==
+ In general the problem is that a "low" boost is still a boost, it can only improve the score of documents that match. One way to fake a "negative boost" is to give a high boost to everything that does *not* match. For example:
+
+ bq=(*:* -field_a:54^10000)
+
+ TODO: If "bq" supports pure negative queries then you can simplify that to bq=-field_a:54^10000
+
== TODO ==
/!\ :TODO: /!\
* shorter fields score higher