* R-N-S-C-O-L : 48sec local mode, 83 nodes
* R-N-S-L-C-O : never finish, timeout problem, 3783 nodes
* rule bushy plan : 51sec local mode, even less total parallelism used
*/
DataSourceComponent regionSource = ncg.generateDataSource("REGION");
DataSourceComponent nationSource = ncg.generateDataSource("NATION");
Component R_Njoin = ncg.generateEquiJoin(regionSource, nationSource);
DataSourceComponent supplierSource = ncg.generateDataSource("SUPPLIER");
Component R_N_Sjoin = ncg.generateEquiJoin(R_Njoin, supplierSource);
DataSourceComponent lineitemSource = ncg.generateDataSource("LINEITEM");
Component R_N_S_Ljoin = ncg.generateEquiJoin(R_N_Sjoin, lineitemSource);