**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.
else
        {
            month = pos[0] - '0';
            if (isNumericASCII(pos[1]))
            {
                month = month * 10 + pos[1] - '0';
                pos += 3;
            }
            else
                pos += 2;
            if (isNumericASCII(pos[-1]))
                return ReturnType(false);
            day = pos[0] - '0';
            if (isNumericASCII(pos[1]))
            {
                day = day * 10 + pos[1] - '0';
                pos += 2;
            }
            else
                pos += 1;
        }
        buf.position() = pos;
        date = LocalDate(year, month, day);
        return ReturnType(true);
    }
    else
        return readDateTextFallback<ReturnType>(date, buf);
}
template <typename ReturnType = void>
inline ReturnType readDateTextImpl(DayNum & date, ReadBuffer & buf)