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From: Apache Wiki <wikidiffs@apache.org>
To: Apache Wiki <wikidiffs@apache.org>
Date: Thu, 10 Mar 2011 21:16:27 -0000
Message-ID: <20110310211627.31255.86841@eosnew.apache.org>
Subject: 
 =?utf-8?q?=5BSolr_Wiki=5D_Update_of_=22FunctionQuery=22_by_YonikSeeley?=

Dear Wiki user,

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

The "FunctionQuery" page has been changed by YonikSeeley.
The comment on this change is: document relevance function queries.
http://wiki.apache.org/solr/FunctionQuery?action=3Ddiff&rev1=3D74&rev2=3D75

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

  =

  See the java.util.Math javadocs for more details.
  =

+ =3D=3D Relevance Functions =3D=3D
+ [[Solr4.0]]
+ =

+ Relevancy functions that take terms can use a bare term if it's a simple =
word
+  . Example: '''docfreq(text,solr)'''
+ Can optionally quote the term if it's more complex
+  . Example: '''docfreq(text,'solr')'''
+ And can even do parameter substitution for the term value
+  . Example Partial Request: '''&defType=3Dfunc&q=3Ddocfreq(text,$myterm)&=
term=3Dsolr'''
+ =

+ =3D=3D=3D docfreq =3D=3D=3D
+ '''docfreq(field,term)''' returns the number of documents that contain th=
e term in the field.  This is a constant (the same value for all documents =
in the index).
+ =

+  . Example Syntax: '''docfreq(text,'solr')'''
+ =

+ =3D=3D=3D termfreq =3D=3D=3D
+ '''termfreq(field,term)''' returns the number of times the term appears i=
n the field for that document.
+ =

+  . Example Syntax: '''docfreq(text,'memory')'''
+ =

+ =3D=3D=3D idf =3D=3D=3D
+ '''idf(field,term)''' returns the inverse document frequency for the give=
n term, using the [[http://lucene.apache.org/java/3_0_0/api/core/org/apache=
/lucene/search/Similarity.html|Similarity] for the field.
+ =

+  . Example Syntax: '''idf(text,'solr')'''
+ =

+ =3D=3D=3D tf =3D=3D=3D
+ '''tf(field,term)''' returns the term frequency factor for the given term=
, using the [[http://lucene.apache.org/java/3_0_0/api/core/org/apache/lucen=
e/search/Similarity.html|Similarity] for the field.
+ =

+  . Example Syntax: '''tf(text,'solr')'''
+ =

+ =3D=3D=3D norm =3D=3D=3D
+ '''norm(field)''' returns the "norm" stored in the index, the product of =
the index time boost and then length normalization factor, according to the=
  [[http://lucene.apache.org/java/3_0_0/api/core/org/apache/lucene/search/S=
imilarity.html|Similarity] for the field.
+ =

+  . Example Syntax: '''norm(text)'''
+ =

+ =3D=3D=3D maxdoc =3D=3D=3D
+ '''maxdoc()''' returns the number of documents in the index, including th=
ose that are marked as deleted but have not yet been purged.  This is a con=
stant (the same value for all documents in the index).
+ =

+ =3D=3D=3D numdocs =3D=3D=3D
+ '''numdocs()''' returns the number of documents in the index, not includi=
ng those that are marked as deleted but have not yet been purged.  This is =
a constant (the same value for all documents in the index).
+ =

+ =

  =3D=3D dist =3D=3D
  [[Solr3.1]]
 =20