text: t = db.distinct_array1;
  t.drop();
  
  t.save( { a : [1,2,3] } )
  t.save( { a : [2,3,4] } )
  t.save( { a : [3,4,5] } )
  t.save( { a : 9 } )
  
  
  // Without index.
  res = t.distinct( "a" ).sort();
  assert.eq( "1,2,3,4,5,9" , res.toString() , "A1" );
  
  // Array element 0 without index.
  res = t.distinct( "a.0" ).sort();
  assert.eq( "1,2,3" , res.toString() , "A2" );
  
  // Array element 1 without index.
  res = t.distinct( "a.1" ).sort();
  assert.eq( "2,3,4" , res.toString() , "A3" );
  
  // With index.
  t.ensureIndex( { a : 1 } );
  res = t.distinct( "a" ).sort();
  assert.eq( "1,2,3,4,5,9" , res.toString() , "A4" );
  
  // Array element 0 with index.
  res = t.distinct( "a.0" ).sort();
  assert.eq( "1,2,3" , res.toString() , "A5" );
  
  // Array element 1 with index.
  res = t.distinct( "a.1" ).sort();
  assert.eq( "2,3,4" , res.toString() , "A6" );
  
  //t.drop();
  
  t.save( { a : [{b:"a"}, {b:"d"}] , c : 12 } );
  t.save( { a : [{b:"b"}, {b:"d"}] , c : 12 } );
  t.save( { a : [{b:"c"}, {b:"e"}] , c : 12 } );
  t.save( { a : [{b:"c"}, {b:"f"}] , c : 12 } );
  t.save( { a : [] , c : 12 } );
  t.save( { a : { b : "z"} , c : 12 } );
  
  // Without index.
  res = t.distinct( "a.b" ).sort();
  assert.eq( "a,b,c,d,e,f,z" , res.toString() , "B1" );
  
  // Array element 0 without index
  res = t.distinct( "a.0.b" ).sort();
  assert.eq( "a,b,c" , res.toString() , "B2" );
  
  // Array element 1 without index
  res = t.distinct( "a.1.b" ).sort();
  assert.eq( "d,e,f" , res.toString() , "B3" );
  
  // With index.
  t.ensureIndex( { "a.b" : 1 } );
  res = t.distinct( "a.b" );
  res.sort()
  assert.eq( "a,b,c,d,e,f,z" , res.toString() , "B4" );
  
  // _id as an document containing an array
  t.save( { _id : { a : [1,2,3] } } )
  t.save( { _id : { a : [2,3,4] } } )
  t.save( { _id : { a : [3,4,5] } } )
  t.save( { _id : { a : 9 } } )
  
  // Without index.
  res = t.distinct( "_id.a" ).sort();
  assert.eq( "1,2,3,4,5,9" , res.toString() , "C1" );
  
  // Array element 0 without index.
  res = t.distinct( "_id.a.0" ).sort();
  assert.eq( "1,2,3" , res.toString() , "C2" );
  
  // Array element 1 without index.
  res = t.distinct( "_id.a.1" ).sort();
  assert.eq( "2,3,4" , res.toString() , "C3" );
  
  // With index.
  t.ensureIndex( { "_id.a" : 1 } );
  res = t.distinct( "_id.a" ).sort();
  assert.eq( "1,2,3,4,5,9" , res.toString() , "C4" );
  
  // Array element 0 with index.
  res = t.distinct( "_id.a.0" ).sort();
  assert.eq( "1,2,3" , res.toString() , "C5" );
  
  // Array element 1 with index.
  res = t.distinct( "_id.a.1" ).sort();
  assert.eq( "2,3,4" , res.toString() , "C6" );
  