G select * from t1, t2; (before rewrites) cluster0 Box0:Select cluster2 Box2:BaseTable T2 cluster1 Box1:BaseTable T1 boxhead0 Distinct: Preserve 0: Q0.c0 as F1 1: Q0.c1 as F2 2: Q0.c2 as F3 3: Q1.c0 as F1 4: Q1.c1 as F2 5: Q1.c2 as F3 Q0 Q0(F) as T1 boxhead1 Distinct: Preserve 0: c0 as F1 1: c1 as F2 2: c2 as F3 Q0->boxhead1 Q1 Q1(F) as T2 boxhead2 Distinct: Preserve 0: c0 as F1 1: c1 as F2 2: c2 as F3 Q1->boxhead2