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From Apache Wiki <>
Subject [Solr Wiki] Update of "FunctionQuery" by BensonMargulies
Date Sun, 15 Apr 2012 16:34:14 GMT
Dear Wiki user,

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The "FunctionQuery" page has been changed by BensonMargulies:

A little hint about how function queries contribute to scoring.

   1. Use a parameter that has an explicit type of FunctionQuery, such as [[DisMaxQParserPlugin]]'s
'''bf''' (boost function) parameter, or extended dismax '''boost''' parameter (multiplicative
    * NOTE: the '''bf''' parameter actually takes a list of function queries separated by
whitespace and each with an optional boost.  Make sure to eliminate any internal whitespace
in single function queries when using '''bf'''.
    * Example: {{{q=foo&bf="ord(popularity)^0.5 recip(rord(price),1,1000,1000)^0.3"}}}
+ If you use a function query as 'just another term' (for example, by using the special field
name '''_val_'''), the value of the function becomes a component of the overall query score,
just as with any other part of the query. This includes the standard normalization, which
amounts (by default) by multiplying scores by a magic constant (that by default is the inverse
of the sum of squared weights)
  See SolrPlugins#ValueSourceParser for information on how to hook in your own FunctionQuery.

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