set allow_suspicious_low_cardinality_types=1; drop table if exists perf_lc_num; CREATE TABLE perf_lc_num(  num UInt8,  arr Array(LowCardinality(Int64)) default [num]  ) ENGINE = TinyLog; INSERT INTO perf_lc_num (num) SELECT toUInt8(number) FROM numbers(10000000); select sum(length(arr)) from perf_lc_num; select sum(length(arr)), sum(num) from perf_lc_num; INSERT INTO perf_lc_num (num) SELECT toUInt8(number) FROM numbers(10000000); select sum(length(arr)) from perf_lc_num; select sum(length(arr)), sum(num) from perf_lc_num; drop table if exists perf_lc_num; CREATE TABLE perf_lc_num(  num UInt8,  arr Array(LowCardinality(Int64)) default [num]  ) ENGINE = Log; INSERT INTO perf_lc_num (num) SELECT toUInt8(number) FROM numbers(10000000); select sum(length(arr)) from perf_lc_num; select sum(length(arr)), sum(num) from perf_lc_num; INSERT INTO perf_lc_num (num) SELECT toUInt8(number) FROM numbers(10000000); select sum(length(arr)) from perf_lc_num; select sum(length(arr)), sum(num) from perf_lc_num; drop table if exists perf_lc_num; CREATE TABLE perf_lc_num(  num UInt8,  arr Array(LowCardinality(Int64)) default [num]  ) ENGINE = StripeLog; INSERT INTO perf_lc_num (num) SELECT toUInt8(number) FROM numbers(10000000); select sum(length(arr)) from perf_lc_num; select sum(length(arr)), sum(num) from perf_lc_num; INSERT INTO perf_lc_num (num) SELECT toUInt8(number) FROM numbers(10000000); select sum(length(arr)) from perf_lc_num; select sum(length(arr)), sum(num) from perf_lc_num; drop table if exists perf_lc_num;