File: indexc.js

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

for ( var i=1; i<100; i++ ){
    var d = new Date( ( new Date() ).getTime() + i );
    t.save( { a : i , ts : d , cats : [ i , i + 1 , i + 2 ] } );
    if ( i == 51 )
        mid = d;
}

assert.eq( 50 , t.find( { ts : { $lt : mid } } ).itcount() , "A" );
assert.eq( 50 , t.find( { ts : { $lt : mid } } ).sort( { ts : 1 } ).itcount() , "B" );

t.ensureIndex( { ts : 1 , cats : 1 } );
t.ensureIndex( { cats : 1 } );

// multi-key bug was firing here (related to getsetdup()):
assert.eq( 50 , t.find( { ts : { $lt : mid } } ).itcount() , "C" );
assert.eq( 50 , t.find( { ts : { $lt : mid } } ).sort( { ts : 1 } ).itcount() , "D" );