[Solr Wiki] Update of "FunctionQuery" by YonikSeeley

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The following page has been changed by YonikSeeley:
http://wiki.apache.org/solr/FunctionQuery

The comment on the change is:
document top()

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  max(x,c) returns the max of another function and a constant.  Useful for "bottoming out" another function at some constant.
      Example Syntax: '''max(myfield,0)'''
  
+ === 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)).
+ 
  === General Example ===
      To give more idea about the use of the function query, suppose index stores dimensions in meters '''x''', '''y''','''z''' of some hypothetical boxes with arbitrary names stored in field '''boxname'''.
      Suppose we want to search for box matching name ''findbox'' but ranked according to volumes of boxes, the query params would be: