create table t (c_decimal decimal);
alter table t set tiflash replica 1; -- wait ready.
insert into t values (9), (10);
prepare s1 from 'select * from t where ? <= c_decimal';
set @v1 = 9.330;
execute s1 using @v1;
+-----------+
| c_decimal |
+-----------+
|        10 |
+-----------+

mysql> create table t(d decimal(3,2));
mysql> alter table t set tiflash replica 1; --wait ready

mysql> insert into t values (1.11), (2.222);
Query OK, 2 rows affected, 1 warning (0.03 sec) -- the warning is: Truncated incorrect DECIMAL value: '2.222'
mysql> insert into t values (33.3);
ERROR 1264 (22003): Out of range value for column 'd' at row 1

mysql> insert into t values ('1.11'), ('2.222');
Query OK, 2 rows affected, 1 warning (0.01 sec)
mysql> insert into t values ('33.3');
ERROR 1264 (22003): Out of range value for column 'd' at row 1

mysql> prepare s1 from 'insert t (d) values (?), (?)';
mysql> prepare s2 from 'insert t (d) values (?)';

mysql> set @a='1.11', @b='2.222', @c='33.3';
mysql> execute s1 using @a, @b;
Query OK, 2 rows affected, 1 warning (0.01 sec)
mysql> execute s2 using @c;
ERROR 1264 (22003): Out of range value for column 'd' at row 1

mysql> set @a=1.11, @b=2.222, @c=33.3;
mysql> execute s1 using @a, @b;
Query OK, 2 rows affected, 1 warning (0.02 sec)
mysql> execute s2 using @c;
ERROR 1264 (22003): Out of range value for column 'd' at row 1