**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 (buf.eof() || *buf.position() != quote)
    {
        throw ParsingException(ErrorCodes::CANNOT_PARSE_QUOTED_STRING,
            "Cannot parse quoted string: expected opening quote '{}', got '{}'",
            std::string{quote}, buf.eof() ? "EOF" : std::string{*buf.position()});
    }
    ++buf.position();
    while (!buf.eof())
    {
        char * next_pos = find_first_symbols<'\\', quote>(buf.position(), buf.buffer().end());
        appendToStringOrVector(s, buf, next_pos);
        buf.position() = next_pos;
        if (!buf.hasPendingData())
            continue;
        if (*buf.position() == quote)
        {
            ++buf.position();