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From Apache Wiki <wikidi...@apache.org>
Subject [Solr Wiki] Update of "FunctionQuery" by GrantIngersoll
Date Thu, 24 Dec 2009 12:21:28 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=51&rev2=52

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

  
  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.
  
+ 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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