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From Apache Wiki <>
Subject [Solr Wiki] Update of "FunctionQuery" by BrianPanulla
Date Wed, 06 Jun 2012 21:05:36 GMT
Dear Wiki user,

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The "FunctionQuery" page has been changed by BrianPanulla:

Explained the return type of strdist(), since it's different from the common Levenshtein implementation.

   1. ngram - The NGramDistance, if specified, can optionally pass in the ngram size too.
 Default is 2.
   1. FQN - Fully Qualified class Name for an implementation of the StringDistance interface.
 Must have a no-arg constructor.
+ This function returns a float between 0 and 1 based on how similar the specified strings
are to one another. Returning a value of 1 means the specified strings are identical and 0
means the string are maximally different.
  == top ==
  <!> [[Solr1.4]] Causes it's function query argument to derive it's values from the
top-level IndexReader containing all parts of an index.  For example, the ordinal of a value
in a single segment will be different from the ordinal of that same value in the complete
index.  The ord() and rord() functions implicitly use top() and hence ord(foo) is equivalent
to top(ord(foo)).

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