*** Not partitioned *** Parts before OPTIMIZE: tuple() all_0_0_0 tuple() all_1_1_0 Parts after OPTIMIZE: tuple() all_0_1_1 Sum before DETACH PARTITION: 15 Sum after DETACH PARTITION: 0 *** Partitioned by week *** Parts before OPTIMIZE: 1999-12-27 19991227_0_0_0 2000-01-03 20000103_0_0_0 2000-01-03 20000103_1_1_0 Parts after OPTIMIZE: 1999-12-27 19991227_0_0_0 2000-01-03 20000103_0_1_1 Sum before DROP PARTITION: 15 Sum after DROP PARTITION: 12 *** Partitioned by a (Date, UInt8) tuple *** Parts before OPTIMIZE: (\'2000-01-01\',1) 20000101-1_0_0_0 (\'2000-01-01\',1) 20000101-1_1_1_0 (\'2000-01-01\',2) 20000101-2_0_0_0 (\'2000-01-02\',1) 20000102-1_0_0_0 (\'2000-01-02\',1) 20000102-1_1_1_0 Parts after OPTIMIZE: (\'2000-01-01\',1) 20000101-1_0_1_1 (\'2000-01-01\',2) 20000101-2_0_0_0 (\'2000-01-02\',1) 20000102-1_0_1_1 Sum before DETACH PARTITION: 15 Sum after DETACH PARTITION: 9 *** Partitioned by String *** Parts before OPTIMIZE: bbb 7d878f3d88441d2b3dc371e2a3050f6d_0_0_0 bbb 7d878f3d88441d2b3dc371e2a3050f6d_1_1_0 aaa 9b50856126a8a6064f11f027d455bf58_0_0_0 aaa 9b50856126a8a6064f11f027d455bf58_1_1_0 Parts after OPTIMIZE: bbb 7d878f3d88441d2b3dc371e2a3050f6d_0_0_0 bbb 7d878f3d88441d2b3dc371e2a3050f6d_1_1_0 aaa 9b50856126a8a6064f11f027d455bf58_0_1_1 Sum before DROP PARTITION: 15 Sum after DROP PARTITION: 8 *** Table without columns with fixed size *** Parts: 1 1_0_0_1 2 2 2_0_0_0 2 Before DROP PARTITION: a aa b cc After DROP PARTITION: aa cc