**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.
{
    s.clear();
    readCSVStringInto(s, buf, settings);
}
void readCSVField(String & s, ReadBuffer & buf, const FormatSettings::CSV & settings)
{
    s.clear();
    bool add_quote = false;
    char quote = '\'';
    if (!buf.eof() && (*buf.position() == '\'' || *buf.position() == '"'))
    {
        quote = *buf.position();
        s.push_back(quote);
        add_quote = true;
    }
    readCSVStringInto(s, buf, settings);
    if (add_quote)
        s.push_back(quote);
}
template void readCSVStringInto<PaddedPODArray<UInt8>>(PaddedPODArray<UInt8> & s, ReadBuffer & buf, const FormatSettings::CSV & settings);
template <typename Vector, typename ReturnType>
ReturnType readJSONStringInto(Vector & s, ReadBuffer & buf)