32. The method of claim 29 , further comprising, when the map is present at the top level of the cumulative schema, inserting a join key column into the additional table and inserting a join key column into the root table.
32. The method of claim 29 , further comprising, when the map is present at the top level of the cumulative schema, inserting a join key column into the additional table and inserting a join key column into the root table. 33. The method of claim 32 , further comprising, when the map is nested in the cumulative schema below the top level, inserting the join key column into the additional table and inserting a join key column into an intermediate table.