this.design = new PhysicalDesign(info.catalogContext.database);
this.design.plan = this.pplan;
this.final_graph = new PartitionTree(this.info.catalogContext.database);
new PartitionPlanTreeGenerator(this.info, this.pplan).generate(this.final_graph);
// System.out.println(this.plan);
// System.exit(1);
//
// Step 3: Partition Placement/Mapper