create table t_lz4(a UInt64) engine=MergeTree order by tuple() create table t_lz4_norm(a UInt64) engine=MergeTree order by tuple() create table t_lz4_uncomp(a UInt32) engine=MergeTree order by a insert into t_lz4 select number % 100 from numbers_mt(5e7) order by rand() optimize table t_lz4 final insert into t_lz4_norm select number from numbers_mt(5e7) order by rand() optimize table t_lz4_norm final insert into t_lz4_uncomp select number from numbers_mt(5e7) optimize table t_lz4_uncomp final select a from t_lz4 format Null select a from t_lz4_norm format Null select a from t_lz4_uncomp format Null drop table t_lz4 drop table t_lz4_norm drop table t_lz4_uncomp