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 (!command.data_type)
                throw Exception{"Data type have to be specified for column " + backQuote(column_name) + " to add",
                                ErrorCodes::BAD_ARGUMENTS};
            if (command.codec)
                CompressionCodecFactory::instance().validateCodecAndGetPreprocessedAST(command.codec, command.data_type, !context->getSettingsRef().allow_suspicious_codecs, context->getSettingsRef().allow_experimental_codecs);
            all_columns.add(ColumnDescription(column_name, command.data_type));
        }
        else if (command.type == AlterCommand::MODIFY_COLUMN)
        {
            if (!all_columns.has(column_name))
            {
                if (!command.if_exists)
                    throw Exception{"Wrong column name. Cannot find column " + backQuote(column_name) + " to modify",
                                    ErrorCodes::NOT_FOUND_COLUMN_IN_BLOCK};
                else
                    continue;
            }
            if (renamed_columns.count(column_name))
                throw Exception{"Cannot rename and modify the same column " + backQuote(column_name) + " in a single ALTER query",
                                ErrorCodes::NOT_IMPLEMENTED};
            if (command.codec)
                CompressionCodecFactory::instance().validateCodecAndGetPreprocessedAST(command.codec, command.data_type, !context->getSettingsRef().allow_suspicious_codecs, context->getSettingsRef().allow_experimental_codecs);
            auto column_default = all_columns.getDefault(column_name);
            if (column_default)
            {
                if (command.to_remove == AlterCommand::RemoveProperty::DEFAULT && column_default->kind != ColumnDefaultKind::Default)
                {
                    throw Exception(
                        ErrorCodes::BAD_ARGUMENTS,
                        "Cannot remove DEFAULT from column {}, because column default type is {}. Use REMOVE {} to delete it",