*** Not partitioned *** Parts before OPTIMIZE: tuple() all_1_1_0 tuple() all_2_2_0 Parts after OPTIMIZE: tuple() all_1_2_1 Sum before DETACH PARTITION: 15 Sum after DETACH PARTITION: 0 *** Partitioned by week *** Parts before OPTIMIZE: \'1999-12-27\' 19991227_1_1_0 \'2000-01-03\' 20000103_2_2_0 \'2000-01-03\' 20000103_3_3_0 Parts after OPTIMIZE: \'1999-12-27\' 19991227_1_1_0 \'2000-01-03\' 20000103_2_3_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_1_1_0 (\'2000-01-01\', 1) 20000101-1_5_5_0 (\'2000-01-01\', 2) 20000101-2_2_2_0 (\'2000-01-02\', 1) 20000102-1_3_3_0 (\'2000-01-02\', 1) 20000102-1_4_4_0 Parts after OPTIMIZE: (\'2000-01-01\', 1) 20000101-1_1_5_1 (\'2000-01-01\', 2) 20000101-2_2_2_0 (\'2000-01-02\', 1) 20000102-1_3_4_1 Sum before DETACH PARTITION: 15 Sum after DETACH PARTITION: 9 *** Partitioned by String *** Parts before OPTIMIZE: \'bbb\' 7d878f3d88441d2b3dc371e2a3050f6d_2_2_0 \'bbb\' 7d878f3d88441d2b3dc371e2a3050f6d_3_3_0 \'aaa\' 9b50856126a8a6064f11f027d455bf58_1_1_0 \'aaa\' 9b50856126a8a6064f11f027d455bf58_4_4_0 Parts after OPTIMIZE: \'bbb\' 7d878f3d88441d2b3dc371e2a3050f6d_2_2_0 \'bbb\' 7d878f3d88441d2b3dc371e2a3050f6d_3_3_0 \'aaa\' 9b50856126a8a6064f11f027d455bf58_1_4_1 Sum before DROP PARTITION: 15 Sum after DROP PARTITION: 8 *** Table without columns with fixed size *** Parts: 1 1_1_1_0 2 2 2_2_2_0 2 Before DROP PARTITION: a aa b cc After DROP PARTITION: aa cc