Railo 4.2 Reference
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Object Method Query.reduce

Iterates over every row of the given query and calls the closure with that row.
      This function will reduce the query to a single value and will return this value.
Query.reduce(function closure,[object initalValue]):any


The arguments for this function are set. You can not use other arguments except the following ones.
Name Type Required Description
closure function  Yes function/closure that implements the following constructor [function(any result, struct row[, number rowNumber, query query]):any].
initalValue object  No inital value passed as part of the first closure call