NativeReader LowCardinality(String) 123_a 2 LowCardinality(String) 123_bb 3 123_ LowCardinality(String) 123_ 1 123_a LowCardinality(String) 123_a 2 123_bb LowCardinality(String) 123_ccc 4 123_ccc LowCardinality(String) 123_a 2 123_dddd LowCardinality(String) 123_bb 3 LowCardinality(String) 123_ 1 LowCardinality(String) 123_dddd 5 - LowCardinality(Nullable(String)) 123_a 3 \N LowCardinality(Nullable(String)) \N 0 LowCardinality(Nullable(String)) 123_bb 4 123_ LowCardinality(Nullable(String)) 123_ 2 123_a LowCardinality(Nullable(String)) 123_a 3 123_bb LowCardinality(Nullable(String)) \N 0 123_ccc LowCardinality(Nullable(String)) 123_ccc 5 123_dddd LowCardinality(Nullable(String)) 123_a 3 \N LowCardinality(Nullable(String)) 123_bb 4 \N LowCardinality(Nullable(String)) 123_ 2 \N LowCardinality(Nullable(String)) 123_dddd 6 \N MergeTree 499500000 499999500000