The result of decimal divide won't round at some precision. #6462
Description
Bug Report
1. Minimal reproduce step (Required)
drop table ish;
create table ish(a decimal(4,0), b decimal(40, 20));
alter table ish set tiflash replica 1;
insert into ish values (1, 10001);
set tidb_enforce_mpp=1;
select a/b from ish;2. What did you expect to see? (Required)
+--------+
| a/b |
+--------+
| 0.0001 |
+--------+
3. What did you see instead (Required)
+--------+
| a/b |
+--------+
| 0.0000 |
+--------+
4. What is your TiFlash version? (Required)
6.5