presto-parser/src/main/java/io/prestosql/sql/tree/FetchFirst.java/FetchFirst/toString
class FetchFirst:    @Override
    public String toString()
    {
        return toStringHelper(this)
                .add("rowCount", rowCount.orElse(null))
                .add("withTies", withTies)
                .omitNullValues()
                .toString();
    }