This issue is hard to reproduce, it happens 10 times in last 24 hours

duration_hr is a field with type Decimal (13, 4), I found some abnormal conversion during the ClickHouse replication, as below:
```
MySQL     ClickHouse
0.3333 -> -2147483653.2202
0.5000 -> -2147483653.0535
0.1667 -> -2147483653.3868
0.0833 -> -2147483653.4702
0.7500 -> -2147483652.8035
```
As you can see, a weired one among the normal ones:
```
│ HCAC    │ 2020-10-22 07:10:00 │           0.3333 │
│ HCAC    │ 2020-10-22 07:15:00 │           0.3333 │
│ HCAC    │ 2020-10-22 07:20:00 │           0.3333 │
│ HCAC    │ 2020-10-22 07:25:00 │           0.3333 │
│ HCAC    │ 2020-10-22 07:30:00 │           0.3333 │
│ HCAC    │ 2020-10-22 07:35:00 │ -2147483653.2202 │
│ HCAC    │ 2020-10-22 07:40:00 │           0.3333 │
│ HCAC    │ 2020-10-22 07:45:00 │           0.3333 │
│ HCAC    │ 2020-10-22 07:50:00 │           0.3333 │
│ HCAC    │ 2020-10-22 07:55:00 │           0.3333 │
│ HCAC    │ 2020-10-22 08:00:00 │           0.3333 │
│ HCAC    │ 2020-10-22 08:05:00 │           0.3333 │
```


-Lyon
break;
            }
            case XID_EVENT: {
                if (pending_gtid)
                {
                    gtid_sets.update(*pending_gtid);
                    pending_gtid.reset();
                }
                binlog_pos = event->header.log_pos;
                break;
            }
            case ROTATE_EVENT: {
                auto rotate = std::static_pointer_cast<RotateEvent>(event);
                binlog_name = rotate->next_binlog;
                binlog_pos = event->header.log_pos;
                break;
            }
            case GTID_EVENT: {
                if (pending_gtid)
                    gtid_sets.update(*pending_gtid);
                auto gtid_event = std::static_pointer_cast<GTIDEvent>(event);
                binlog_pos = event->header.log_pos;
                pending_gtid = gtid_event->gtid;
                break;
            }
            default:
                throw ReplicationError("Position update with unsupported event", ErrorCodes::LOGICAL_ERROR);
        }
    }
    void Position::update(UInt64 binlog_pos_, const String & binlog_name_, const String & gtid_sets_)