**Describe the situation**
https://markify.dev/p/zfrQMV2/text

**How to reproduce**
On aws `c5ad.24xlarge` run a query:

```
SET max_memory_usage = '100G', max_threads = 1000, max_insert_threads = 96

INSERT INTO wikistat WITH
    parseDateTimeBestEffort(extract(toLowCardinality(_path), 'pageviews-([\\d\\-]+)\\.gz$')) AS time,
    splitByChar(' ', line) AS values,
    splitByChar('.', values[1]) AS projects
SELECT
    time,
    projects[1] AS project,
    projects[2] AS subproject,
    values[2] AS path,
    CAST(values[3], 'UInt64') AS hits
FROM s3('https://....s3.eu-central-1.amazonaws.com/wikistat/original/*.gz', '...', '...', LineAsString, auto)
WHERE length(values) >= 3
```

Performance is not bad (22 million rows are inserted per second) but can be better.
components.fractional *= 10;
                components.fractional += *buf.position() - '0';
                ++buf.position();
            }
            else
            {
                
                components.fractional *= 10;
            }
        }
        
        while (!buf.eof() && isNumericASCII(*buf.position()))
            ++buf.position();
    }
    
    else if (whole >= 9908870400LL)
    {
        
        
        components.fractional =  components.whole % common::exp10_i32(scale);
        components.whole = components.whole / common::exp10_i32(scale);
    }
    datetime64 = DecimalUtils::decimalFromComponents<DateTime64>(components, scale);
    return ReturnType(true);
}
inline void readDateTimeText(time_t & datetime, ReadBuffer & buf, const DateLUTImpl & time_zone = DateLUT::instance())
{
    readDateTimeTextImpl<void>(datetime, buf, time_zone);
}
inline void readDateTime64Text(DateTime64 & datetime64, UInt32 scale, ReadBuffer & buf, const DateLUTImpl & date_lut = DateLUT::instance())