should report error when divide 0 occurs when adding a generated index with default sql mode

[lcwangchao]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

> create table t1(a int);
> insert into t1 values(0);
> alter table t1 add index i((100/a));

2. What did you expect to see? (Required)

In mysql8.0

mysql> alter table t1 add index i((100/a));
ERROR 1365 (22012): Division by 0

3. What did you see instead (Required)

mysql> alter table t1 add index i((100/a));
Query OK, 0 rows affected (0.76 sec)

4. What is your TiDB version? (Required)

master

[D3Hunter]

as discussed( @lcwangchao @tangenta) , we won't pick this to previous version until it's required