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
ErrorCodes::BAD_ARGUMENTS);
            ++insert_it;
        }
        metadata.secondary_indices.emplace(insert_it, IndexDescription::getIndexFromAST(index_decl, metadata.columns, context));
    }
    else if (type == DROP_INDEX)
    {
        if (!partition && !clear)
        {
            auto erase_it = std::find_if(
                    metadata.secondary_indices.begin(),
                    metadata.secondary_indices.end(),
                    [this](const auto & index)
                    {
                        return index.name == index_name;
                    });
            if (erase_it == metadata.secondary_indices.end())
            {
                if (if_exists)
                    return;
                throw Exception("Wrong index name. Cannot find index " + backQuote(index_name) + " to drop.", ErrorCodes::BAD_ARGUMENTS);
            }
            metadata.secondary_indices.erase(erase_it);
        }
    }
    else if (type == ADD_CONSTRAINT)
    {
        auto constraints = metadata.constraints.getConstraints();
        if (std::any_of(
                constraints.cbegin(),