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
auto & sorting_key = metadata.sorting_key;
        auto & primary_key = metadata.primary_key;
        if (primary_key.definition_ast == nullptr && sorting_key.definition_ast != nullptr)
        {
            
            
            
            primary_key = KeyDescription::getKeyFromAST(sorting_key.definition_ast, metadata.columns, context);
        }
        
        sorting_key.recalculateWithNewAST(order_by, metadata.columns, context);
    }
    else if (type == MODIFY_SAMPLE_BY)
    {
        metadata.sampling_key.recalculateWithNewAST(sample_by, metadata.columns, context);
    }
    else if (type == REMOVE_SAMPLE_BY)
    {
        metadata.sampling_key = {};
    }
    else if (type == COMMENT_COLUMN)
    {
        metadata.columns.modify(column_name,
            [&](ColumnDescription & column) { column.comment = *comment; });
    }
    else if (type == COMMENT_TABLE)
    {
        metadata.comment = *comment;
    }
    else if (type == ADD_INDEX)