8 1 CREATE TABLE t_nullable ( key_string1 Nullable(String), key_string2 Nullable(String), key_string3 Nullable(String), key_int64_1 Nullable(Int64), key_int64_2 Nullable(Int64), key_int64_3 Nullable(Int64), key_int64_4 Nullable(Int64), key_int64_5 Nullable(Int64), m1 Int64, m2 Int64 ) ENGINE = Memory insert into t_nullable select ['aaaaaa','bbaaaa','ccaaaa','ddaaaa'][number % 101 + 1], ['aa','bb','cc','dd'][number % 100 + 1], ['aa','bb','cc','dd'][number % 102 + 1], number%10+1, number%10+2, number%10+3, number%10+4,number%10+5, number%6000+1, number%5000+2 from numbers_mt(20000000) select key_string1,key_string2,key_string3, min(m1) from t_nullable group by key_string1,key_string2,key_string3 select key_string3,key_int64_1,key_int64_2, min(m1) from t_nullable group by key_string3,key_int64_1,key_int64_2 select key_int64_1,key_int64_2,key_int64_3,key_int64_4,key_int64_5, min(m1) from t_nullable group by key_int64_1,key_int64_2,key_int64_3,key_int64_4,key_int64_5 select toFloat64(key_int64_1),toFloat64(key_int64_2),toFloat64(key_int64_3),toFloat64(key_int64_4),toFloat64(key_int64_5), min(m1) from t_nullable group by toFloat64(key_int64_1),toFloat64(key_int64_2),toFloat64(key_int64_3),toFloat64(key_int64_4),toFloat64(key_int64_5) limit 10 select toDecimal64(key_int64_1, 3),toDecimal64(key_int64_2, 3),toDecimal64(key_int64_3, 3),toDecimal64(key_int64_4, 3),toDecimal64(key_int64_5, 3), min(m1) from t_nullable group by toDecimal64(key_int64_1, 3),toDecimal64(key_int64_2, 3),toDecimal64(key_int64_3, 3),toDecimal64(key_int64_4, 3),toDecimal64(key_int64_5, 3) limit 10 drop table if exists t_nullable