11. The computer program product of claim 10 , wherein the decomposing further comprises: identifying one or more sub-tuple groups from the first subset of condition columns, wherein the one or more sub-tuple groups comprise each distinct set of values of the sub-tuples in the first subset of condition columns from the groups of rows.
10. The computer program product of claim 9 , wherein the selecting the first subset of condition columns from among the one or more condition columns further comprises: identifying as the first subset of condition columns at least two of the one or more condition columns that are semantically related to one another based on the semantic model.