22.2.1.4422.

```
create table test_alias (K Int64, D Date, S String, B Int64 Alias length(S)) Engine=MergeTree order by K;
insert into test_alias select number, today(), 'sdfsdfsdfsdfsdfds' from numbers(10000000);

session1: 
clickhouse-benchmark -c 10 <<< "insert into test_alias select number, today(), 'sdfsdfsdfsdfsdfds' from numbers(10000)"

session2: 
alter table test_alias drop column B;
0 rows in set. Elapsed: 251.043 sec.
```

especially it can be a problem with S3 disks

Alias columns do not persist in parts even in columns.txt
{
        if (std::any_of(
                metadata.secondary_indices.cbegin(),
                metadata.secondary_indices.cend(),
                [this](const auto & index)
                {
                    return index.name == index_name;
                }))
        {
            if (if_not_exists)
                return;
            else
                throw Exception{"Cannot add index " + index_name + ": index with this name already exists",
                                ErrorCodes::ILLEGAL_COLUMN};
        }
        auto insert_it = metadata.secondary_indices.end();
        
        if (first)
            insert_it = metadata.secondary_indices.begin();
        if (!after_index_name.empty())
        {
            insert_it = std::find_if(
                    metadata.secondary_indices.begin(),
                    metadata.secondary_indices.end(),
                    [this](const auto & index)
                    {
                        return index.name == after_index_name;
                    });
            if (insert_it == metadata.secondary_indices.end())
                throw Exception("Wrong index name. Cannot find index " + backQuote(after_index_name) + " to insert after.",