**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.
bool empty() const { return type == Type::EMPTY; }
    void invalidate() { type = Type::EMPTY; }
    ~AggregatedDataVariants();
    void init(Type type_)
    {
        switch (type_)
        {
            case Type::EMPTY:       break;
            case Type::without_key: break;
        #define M(NAME, IS_TWO_LEVEL) \
            case Type::NAME: NAME = std::make_unique<decltype(NAME)::element_type>(); break;
            APPLY_FOR_AGGREGATED_VARIANTS(M)
        #undef M
        }
        type = type_;
    }
    
    size_t size() const