File: sort6.js

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t = db.sort6;

function get( x ){
    return t.find().sort( { c : x } ).map( function(z){ return z._id; } );
}

// part 1
t.drop();

t.insert({_id:1,c:null})
t.insert({_id:2,c:1})
t.insert({_id:3,c:2})


assert.eq( [3,2,1] ,  get( -1 ) , "A1"  ) // SERVER-635
assert.eq( [1,2,3] , get( 1 ) , "A2" )

t.ensureIndex( { c : 1 } );

assert.eq( [3,2,1] ,  get( -1 ) , "B1"  )
assert.eq( [1,2,3] , get( 1 ) , "B2" )


// part 2
t.drop();

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

assert.eq( [3,2,1] ,  get( -1 ) , "C1"  ) // SERVER-635
assert.eq( [1,2,3] , get( 1 ) , "C2" )

t.ensureIndex( { c : 1 } );

assert.eq( [3,2,1] ,  get( -1 ) , "D1"  )
assert.eq( [1,2,3] , get( 1 ) , "X2" )