21.7.3 throws an exception if `_sample_factor` is used in a query:
```
CREATE TABLE sessions
(
  `user_id` UInt64
)
ENGINE = MergeTree
ORDER BY user_id 
SAMPLE BY user_id;

insert into sessions values(1);

SELECT
    sum(user_id * _sample_factor) 
FROM sessions
SAMPLE 10000000

DB::Exception: Cannot find column `user_id` in source stream (version 21.8.1.7409 (official build))

SELECT
    sum(user_id) 
FROM sessions
SAMPLE 10000000

sum(user_id)
------------
           1
```
No exception on 21.6.5
{
    auto result = selectRangesToRead(prepared_parts);
    auto index_stats = std::move(result.index_stats);
    std::string prefix(format_settings.offset, format_settings.indent_char);
    if (!index_stats.empty())
    {
        
        if (index_stats.size() == 1 && index_stats.front().type == IndexType::None)
            return;
        std::string indent(format_settings.indent, format_settings.indent_char);
        format_settings.out << prefix << "Indexes:\n";
        for (size_t i = 0; i < index_stats.size(); ++i)
        {
            const auto & stat = index_stats[i];
            if (stat.type == IndexType::None)
                continue;
            format_settings.out << prefix << indent << indexTypeToString(stat.type) << '\n';
            if (!stat.name.empty())
                format_settings.out << prefix << indent << indent << "Name: " << stat.name << '\n';
            if (!stat.description.empty())
                format_settings.out << prefix << indent << indent << "Description: " << stat.description << '\n';
            if (!stat.used_keys.empty())
            {