File: geoc.js

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

N = 1000;

for (var i=0; i<N; i++) t.insert({loc:[100+Math.random(), 100+Math.random()], z:0}) 
for (var i=0; i<N; i++) t.insert({loc:[0+Math.random(), 0+Math.random()], z:1}) 
for (var i=0; i<N; i++) t.insert({loc:[-100+Math.random(), -100+Math.random()], z:2}) 

t.ensureIndex({loc:'2d'}) 

function test( z , l ){
    assert.lt( 0 , t.find({loc:{$near:[100,100]}, z:z}).limit(l).itcount() , "z: " + z + " l: " + l );
}

test( 1 , 1 );
test( 1 , 2 );
test( 2 , 2 );
test( 2 , 10 );
test( 2 , 1000 );
test( 2 , 100000 );
test( 2 , 10000000 );