15. The database management system of claim 13 , wherein performing the debugging operations means further comprises: means for skipping at least an unmodified portion of the query execution plan.
15. The database management system of claim 13 , wherein performing the debugging operations means further comprises: means for skipping at least an unmodified portion of the query execution plan. 16. The database management system of claim 15 , wherein performing the debugging operations means further comprises: means for modifying a portion of the query execution plan, and means for skipping at least an unmodified portion of the query execution plan.