**Describe the bug**

-2147483648 is the minimum integer representable with Int32, but ``toInt32OrNull('-2147483648')`` returns ``NULL``. On the other hand ``toInt32('-2147483648')`` correctly returns ``-2147483648``.

**Does it reproduce on recent release?**

Yes. It happens on 21.7.5.29-stable

**How to reproduce**

```
SELECT
    toInt32('-2147483648'),
    toInt32OrNull('-2147483648')

Query id: 94f4e069-6c0e-44d9-8e94-7ee83b90a529

┌─toInt32('-2147483648')─┬─toInt32OrNull('-2147483648')─┐
│            -2147483648 │                         ᴺᵁᴸᴸ │
└────────────────────────┴──────────────────────────────┘
```

**Expected behavior**

``toInt32('-2147483648')`` and ``toInt32OrNull('-2147483648')`` should both return ``-2147483648``.

case '3': [[fallthrough]];
            case '4': [[fallthrough]];
            case '5': [[fallthrough]];
            case '6': [[fallthrough]];
            case '7': [[fallthrough]];
            case '8': [[fallthrough]];
            case '9':
            {
                has_number = true;
                if constexpr (check_overflow == ReadIntTextCheckOverflow::CHECK_OVERFLOW && !is_big_int_v<T>)
                {
                    
                    
                    
                    if (buf.count() - initial_pos + 1 >= std::numeric_limits<T>::max_digits10)
                    {
                        T signed_res = res;
                        if (common::mulOverflow<T>(signed_res, 10, signed_res)
                            || common::addOverflow<T>(signed_res, (*buf.position() - '0'), signed_res))
                            return ReturnType(false);
                        res = signed_res;
                        break;
                    }
                }
                res *= 10;
                res += *buf.position() - '0';
                break;
            }
            default:
                goto end;