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t = db.mr_merge;
t.drop();
t.insert( { a : [ 1 , 2 ] } )
t.insert( { a : [ 2 , 3 ] } )
t.insert( { a : [ 3 , 4 ] } )
outName = "mr_merge_out";
out = db[outName];
out.drop();
m = function(){ for (i=0; i<this.a.length; i++ ) emit( this.a[i] , 1 ); }
r = function(k,vs){ return Array.sum( vs ); }
function tos( o ){
var s = "";
for ( var i=0; i<100; i++ ){
if ( o[i] )
s += i + "_" + o[i];
}
return s;
}
res = t.mapReduce( m , r , { out : outName } )
expected = { "1" : 1 , "2" : 2 , "3" : 2 , "4" : 1 }
assert.eq( tos( expected ) , tos( res.convertToSingleObject() ) , "A" );
t.insert( { a : [ 4 , 5 ] } )
out.insert( { _id : 10 , value : "5" } )
res = t.mapReduce( m , r , { out : outName } )
expected["4"]++;
expected["5"] = 1
assert.eq( tos( expected ) , tos( res.convertToSingleObject() ) , "B" );
t.insert( { a : [ 5 , 6 ] } )
out.insert( { _id : 10 , value : "5" } )
res = t.mapReduce( m , r , { out : { merge : outName } } )
expected["5"]++;
expected["10"] = 5
expected["6"] = 1
assert.eq( tos( expected ) , tos( res.convertToSingleObject() ) , "C" );
// test that the nonAtomic output gives valid result
t.insert( { a : [ 6 , 7 ] } )
out.insert( { _id : 20 , value : "10" } )
res = t.mapReduce( m , r , { out : { merge : outName, nonAtomic: true } } )
expected["6"]++;
expected["20"] = 10
expected["7"] = 1
assert.eq( tos( expected ) , tos( res.convertToSingleObject() ) , "D" );
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