**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.
if (isNumericASCII(*buf.position()))
    {
        
        if (!append_digit(month)
            || !append_digit(month) 
            || !append_digit(day)
            || !append_digit(day)) 
            return error();
    }
    else
    {
        ++buf.position();
        if (!append_digit(month))
            return error();
        append_digit(month);
        if (!buf.eof() && !isNumericASCII(*buf.position()))
            ++buf.position();
        else
            return error();
        if (!append_digit(day))
            return error();
        append_digit(day);
    }
    date = LocalDate(year, month, day);
    return ReturnType(true);
}
template void readDateTextFallback<void>(LocalDate &, ReadBuffer &);
template bool readDateTextFallback<bool>(LocalDate &, ReadBuffer &);
template <typename ReturnType>
ReturnType readDateTimeTextFallback(time_t & datetime, ReadBuffer & buf, const DateLUTImpl & date_lut)