40 lines
857 B
JavaScript
40 lines
857 B
JavaScript
|
|
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()
|