Map Reduce, MongoDB

gistfile1.js

db.runCommand({
	mapreduce: "Page", 
	map : function Map() {
	
		emit(
			this._id,					// how to group
			{"links":this.Links,"has":false}	// associated data point (document)
		); 
	
	},
	reduce : function Reduce(key, values) {
	
	
		var reduced = {"links":[],"has":false}; // initialize a doc (same format as emitted value)
		
		
		for(var i=0,t=values.links.length;i<t;i++){
				if(values.links[i].Hash=="5931305546993178356"){
		
					reduced.has=true;
					reduced.links.push(values.links[i]);
					break;
				}
		}
		
		
		return reduced;	
	
	
	},
	finalize : function Finalize(key, reduced) {
		return reduced.has;
	},
	query : { "value" : true },
	out : { replace: "teste" , db: "teste"  }
 });

Usando a seguinte estrutura de dados https://gist.github.com/3124417