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t = db.explain2
t.drop();
t.ensureIndex( { a : 1 , b : 1 } );
for ( i=1; i<10; i++ ){
t.insert( { _id : i , a : i , b : i , c : i } );
}
function go( q , c , b , o ){
var e = t.find( q ).explain();
assert.eq( c , e.n , "count " + tojson( q ) )
assert.eq( b , e.nscanned , "nscanned " + tojson( q ) )
assert.eq( o , e.nscannedObjects , "nscannedObjects " + tojson( q ) )
}
q = { a : { $gt : 3 } }
go( q , 6 , 7 , 6 );
q.b = 5
go( q , 1 , 1 , 1 );
delete q.b
q.c = 5
go( q , 1 , 7 , 6 );
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