Pivotal Entry-based Method Extend smallest cells 0123456 s r a i t 00 P1:(1,2)(2,2)(6,5) 1s o12 e山2 2:(1,3)(2,3)(6,6) 3r 4 5 j 61 2/2/2021 Topk Search(@ ICD E2013Pivotal Entry-based Method 2/2/2021 TopkSearch @ ICDE2013 33/42 Extend Smallest Cells. P0 : (1,1) P1 : (1,2) (2,2) (6,5) P2 : (1,3) (2,3) (6,6)