jstests/core/indexe.js


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t = db.indexe;
t.drop();

var num = 1000;

for ( i=0; i<num; i++){
    t.insert( { a : "b" } );
}

assert.eq( num , t.find().count() ,"A1" );
assert.eq( num , t.find( { a : "b" } ).count() , "B1" );
assert.eq( num , t.find( { a : "b" } ).itcount() , "C1" );

t.ensureIndex( { a : 1 } );

assert.eq( num , t.find().count() ,"A2" );
assert.eq( num , t.find().sort( { a : 1 } ).count() , "A2a" );
assert.eq( num , t.find( { a : "b" } ).count() , "B2" );
assert.eq( num , t.find( { a : "b" } ).itcount() , "C3" );

t.drop();