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From Apache Wiki <wikidi...@apache.org>
Subject [Solr Wiki] Update of "FunctionQuery" by GrantIngersoll
Date Mon, 28 Dec 2009 14:04:50 GMT
Dear Wiki user,

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

The "FunctionQuery" page has been changed by GrantIngersoll.
http://wiki.apache.org/solr/FunctionQuery?action=diff&rev1=52&rev2=53

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

- FunctionQuery allows one to use the actual value of a numeric field and functions of those
fields in a relevancy score.
+ FunctionQuery allows one to use the actual value of a field and functions of those fields
in a relevancy score.
  
  <<TableOfContents>>
+ 
+ = What is a Function? =
+ 
+ A function can be:
+  1. A Constant (numeric or string literal)
+  1. A Field - see notes later on multivalued/vector fields
+  1. Another Function
  
  = Using FunctionQuery =
  There are a few ways to use FunctionQuery from Solr's HTTP interface:
@@ -322, +329 @@

  http://localhost:8983/solr/select/?q=boxname:findbox+_val_:"div(weight,product(product(x,y),z))"&fl=boxname,x,y,z,weight,score
  }}}
  
- = Single Valued vs. Multi Valued Functions =
+ = Vector Functions =
  
- <!> WARNING: Expert <!>
+ Until [[Solr1.5]], all functions were single valued.  Since [[Solr1.5]], it is now possible
for functions to use multiple values as part of a function calculation.  There is not yet
support for fields that have more than one token, but it is possible to aggregate multiple
single value fields into a vector.
  
- Until [[Solr1.5]], all functions were single valued.  Since [[Solr1.5]], it is now possible
to write multivalued functions by overriding the appropriate !DocValues methods (the ones
that take in an array of the appropriate type, i.e. doubleVal(int doc, double[] vals).  This
is often useful when working with [[http://wiki.apache.org/solr/SchemaXml#Poly_Field_Types|Poly
Fields]].  Note, however, that these multivalued functions must be aggregated up into a single
value function, as the !FunctionQuery itself does not support them.
+ == vector ==
+ 
+ Takes in one or more single sources (i.e. all the stuff above) and creates a vector source.
+ 
+ Signature: vector(x,y,z)
+ 
+ === Distances ===
+ 
+ dist(), hsine() and sqedist() can work with !MultiValueSources
+ 
  
  See the !MultiValueSource class.
  
  See https://issues.apache.org/jira/browse/SOLR-1131
  
- == Multi Valued Function Support ==
- 
- === toMultiVS ===
- <!> Name is subject to change <!>
- Takes in one or more single valued ValueSource instances and creates a multivalue source.
- 
- Signature: toMultiVS(x,y,z)
- 
- === Distances ===
- 
- dist(), hsine() and sqedist() can work with !MultiValueSources
- 

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