30000 60000 30000000000 millions 50 100 window 10 1000 10000 create table moving_sum_{millions}m engine MergeTree order by k as select number % 100 k, rand() v from numbers_mt(1000000 * {millions}) optimize table moving_sum_{millions}m final select k, groupArrayMovingSum({window})(v) from moving_sum_{millions}m group by k format Null select k % 10 kk, groupArrayMovingSum({window})(v) from moving_sum_{millions}m group by kk format Null drop table if exists moving_sum_{millions}m