File: index_sparse2.js

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mongodb 1%3A2.4.10-5
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t = db.index_sparse2;
t.drop();

t.insert( { _id : 1 , x : 1 , y : 1 } )
t.insert( { _id : 2 , x : 2 } )
t.insert( { _id : 3 } )

t.ensureIndex( { x : 1 , y : 1 } )
assert.eq( 2 , t.getIndexes().length , "A1" )
assert.eq( 3 , t.find().sort( { x : 1 , y : 1 } ).itcount() , "A2" )
t.dropIndex( { x : 1 , y : 1 } )
assert.eq( 1 , t.getIndexes().length , "A3" )

t.ensureIndex( { x : 1 , y : 1 } , { sparse : 1 }  )
assert.eq( 2 , t.getIndexes().length , "B1" )
assert.eq( 2 , t.find().sort( { x : 1 , y : 1 } ).itcount() , "B2" )
t.dropIndex( { x : 1 , y : 1 } )
assert.eq( 1 , t.getIndexes().length , "B3" )