A null bitmap is used in the variable-length record representation to indicate if an attribute has a null value. Tuples can have a significant number of characteristics in some applications, the...

A null bitmap is used in the variable-length record representation to indicate if an attribute has a null value. Tuples can have a significant number of characteristics in some applications, the majority of which are null. Is it possible to change the record representation so that the single bit in the null bitmap is the only overhead for a null attribute?