1. A method of implementing an advanced functional behavior in a database management system executed by a computer without introducing new data types, comprising: defining a row property in the database management system executed by the computer, wherein the advanced functional behavior is associated with the row property; modifying one or more components of the database management system executed by the computer, to implement programming logic associated with the row property that performs the advanced functional behavior; specifying a table definition for a table in the database management system executed by the computer, wherein the table definition associates the row property with one or more columns within rows of the table; and invoking the row property in the database management system executed by the computer, wherein the database management system executes the programming logic associated with the row property in order to perform the advanced functional behavior using data stored in the columns within the rows of the table.