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The "FunctionQuery" page has been changed by JackKrupansky: http://wiki.apache.org/solr/FunctionQuery?action=diff&rev1=90&rev2=91 === exists === '''exists(field|function)''' returns true if a value exists for a given document. - Example use: {{{exists(myField)}}} will return if myField has a value, while {{{exists(query(year:2012))}}} will return true for docs with year=2012. + Example use: {{{exists(myField)}}} will return true if myField has a value, while {{{exists(query({!v='year:2012'}))}}} will return true for docs with year=2012. === if === '''if(expression,trueValue,falseValue)''' emits trueValue if the expression is true, else falseValue. An expression can be any function which outputs boolean values, or even functions returning numeric values, in which case value 0 will be interpreted as false, or strings, in which case empty string is interpreted as false.
