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https://github.com/mongodb/mongo.git
synced 2024-12-01 01:21:03 +01:00
44 lines
911 B
JavaScript
44 lines
911 B
JavaScript
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t = db.mr_index
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t.drop()
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outName = "mr_index_out"
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out = db[outName]
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out.drop()
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t.insert( { tags : [ 1 ] } )
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t.insert( { tags : [ 1 , 2 ] } )
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t.insert( { tags : [ 1 , 2 , 3 ] } )
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t.insert( { tags : [ 3 ] } )
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t.insert( { tags : [ 2 , 3 ] } )
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t.insert( { tags : [ 2 , 3 ] } )
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t.insert( { tags : [ 1 , 2 ] } )
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m = function(){
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for ( i=0; i<this.tags.length; i++ )
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emit( this.tags[i] , 1 );
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}
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r = function( k , vs ){
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return Array.sum( vs );
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}
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ex = function(){
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return out.find().sort( { value : 1 } ).explain()
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}
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res = t.mapReduce( m , r , { out : outName } )
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assert.eq( "BasicCursor" , ex().cursor , "A1" )
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out.ensureIndex( { value : 1 } )
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assert.eq( "BtreeCursor value_1" , ex().cursor , "A2" )
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assert.eq( 3 , ex().n , "A3" )
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res = t.mapReduce( m , r , { out : outName } )
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assert.eq( "BtreeCursor value_1" , ex().cursor , "B1" )
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assert.eq( 3 , ex().n , "B2" )
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res.drop()
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