Railo 4.2 Reference
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Object Method Query.map

Calls the given closure with every row in the given query.       the function returns a query that contains all values returned by the closure.
Query.map(function closure,[boolean parallel,[number maxThreads]]):query


The arguments for this function are set. You can not use other arguments except the following ones.
Name Type Required Description
closure function  Yes filter can be a function/closure that implements the following constructor [function(struct row[, number rowNumber, query query]):struct].
The returned struct is used to fill a single query row.
parallel boolean  No execute closures parallel
maxThreads number  No maximum number of threads executed, ignored when argument "parallel" is set to false