**Use case**

```
Received exception from server (version 21.11.1):
Code: 36. DB::Exception: Received from localhost:9000. DB::Exception: Wrong index name. Cannot find index `test_pentagram` to drop.. (BAD_ARGUMENTS)

github-explorer.ru-central1.internal :) ALTER TABLE hackernews DROP INDEX text_pentagram
```

It did not show me the typo.
command.codec = ast_col_decl.codec;
        }
        if (command_ast->column)
            command.after_column = getIdentifierName(command_ast->column);
        if (ast_col_decl.ttl)
            command.ttl = ast_col_decl.ttl;
        command.first = command_ast->first;
        command.if_not_exists = command_ast->if_not_exists;
        return command;
    }
    else if (command_ast->type == ASTAlterCommand::DROP_COLUMN)
    {
        AlterCommand command;
        command.ast = command_ast->clone();
        command.type = AlterCommand::DROP_COLUMN;
        command.column_name = getIdentifierName(command_ast->column);
        command.if_exists = command_ast->if_exists;
        if (command_ast->clear_column)
            command.clear = true;
        if (command_ast->partition)
            command.partition = command_ast->partition;
        return command;
    }
    else if (command_ast->type == ASTAlterCommand::MODIFY_COLUMN)
    {
        AlterCommand command;
        command.ast = command_ast->clone();
        command.type = AlterCommand::MODIFY_COLUMN;
        const auto & ast_col_decl = command_ast->col_decl->as<ASTColumnDeclaration &>();
        command.column_name = ast_col_decl.name;