title: is there any feature of aliasing fields and setting defaults value for a field in mongo db while fetching results without aggregations?
body: <p>1) select f1 as field_one from table; 
  so f1 is aliased to field_one.</p>
  
  <p>2) select decode(f1, 1,one, 2, two, 3, three, 'Not a valid range' ) from table.
  so for value of f1 query returns 
  1 One
  2 Two
  3 Three
  else 
  Not a valid range</p>