[BUG] Error 1118: Row size too large

the total of the row size seems not to be considered.

when applying some generated to MySAQ

```sql
ALTER TABLE xhvphzlk ADD COLUMN (jhdldvmyj varchar(1566) NOT NULL)

Error 1118: Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
```