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path: root/jstests/core/mr_index.js
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t = db.mr_index;
t.drop();

outName = "mr_index_out";
out = db[outName];
out.drop();

t.insert( { tags : [ 1  ] } );
t.insert( { tags : [ 1 , 2  ] } );
t.insert( { tags : [ 1 , 2 , 3 ] } );
t.insert( { tags : [ 3 ] } );
t.insert( { tags : [ 2 , 3 ] } );
t.insert( { tags : [ 2 , 3 ] } );
t.insert( { tags : [ 1 , 2 ] } );

m = function(){ 
    for ( i=0; i<this.tags.length; i++ )
        emit( this.tags[i] , 1 );
};

r = function( k , vs ){
    return Array.sum( vs );
};

ex = function(){
    return out.find().sort( { value : 1 } ).explain("executionStats");
};

res = t.mapReduce(  m , r , { out : outName } );

assert.eq( 3 , ex().executionStats.nReturned , "A1" );
out.ensureIndex( { value : 1 } );
assert.eq( 3 , ex().executionStats.nReturned , "A2" );

res = t.mapReduce(  m , r , { out : outName } );

assert.eq( 3 , ex().executionStats.nReturned , "B1" );
res.drop();