**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``.

return ReturnType(true);
        }
        else
            
            return readIntTextImpl<time_t, ReturnType, ReadIntTextCheckOverflow::CHECK_OVERFLOW>(datetime, buf);
    }
    else
        return readDateTimeTextFallback<ReturnType>(datetime, buf, date_lut);
}
template <typename ReturnType>
inline ReturnType readDateTimeTextImpl(DateTime64 & datetime64, UInt32 scale, ReadBuffer & buf, const DateLUTImpl & date_lut)
{
    time_t whole;
    if (!readDateTimeTextImpl<bool>(whole, buf, date_lut))
    {
        return ReturnType(false);
    }
    DB::DecimalUtils::DecimalComponents<DateTime64> components{static_cast<DateTime64::NativeType>(whole), 0};
    if (!buf.eof() && *buf.position() == '.')
    {
        ++buf.position();
        
        for (size_t i = 0; i < scale; ++i)
        {
            if (!buf.eof() && isNumericASCII(*buf.position()))
            {
                components.fractional *= 10;
                components.fractional += *buf.position() - '0';
                ++buf.position();
            }