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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Fri, 23 Oct 2009 01:24:46 -0000
Message-ID: <20091023012446.16156.62586@eos.apache.org>
Subject: 
 =?utf-8?q?=5BSolr_Wiki=5D_Update_of_=22SolrRelevancyFAQ=22_by_YonikSeeley?=

Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Solr Wiki" for chan=
ge notification.

The "SolrRelevancyFAQ" page has been changed by YonikSeeley.
The comment on this change is: add boosting dismax example.
http://wiki.apache.org/solr/SolrRelevancyFAQ?action=3Ddiff&rev1=3D15&rev2=
=3D16

--------------------------------------------------

  =

  Now the main "q" argument as well as the "dateboost" argument may be spec=
ified as defaults in a search handler in solrconfig.xml, and clients would =
only need to pass "qq", the user query.
  =

+ To boost another query type such as a dismax query, the value of the boos=
t query is a full sub-query and hence can use the {!querytype} syntax. Alte=
rnately, the defType param can be used in the boost local params to set the=
 default type to dismax.  The other dismax parameters may be set as top lev=
el parameters.
+ {{{
+ http://localhost:8983/solr/select?q=3D{!boost b=3D$dateboost v=3D$qq defT=
ype=3Ddismax}&dateboost=3Drecip(ms(NOW,manufacturedate_dt),3.16e-11,1,1)&qf=
=3Dtext&pf=3Dtext&qq=3Dipod
+ }}}
  =

  =3D=3D How do I give a very low boost to documents that match my query =
=3D=3D
  In general the problem is that a "low" boost is still a boost, it can onl=
y improve the score of documents that match. One way to fake a "negative bo=
ost" is to give a high boost to everything that does *not* match. For examp=
le: