drop table if exists lc_00906; create table lc_00906 (b LowCardinality(String)) engine=MergeTree order by b SETTINGS index_granularity = 8192, index_granularity_bytes = '10Mi'; insert into lc_00906 select '0123456789' from numbers(100000000); select count(), b from lc_00906 group by b; drop table if exists lc_00906;