I expect it should work:
```
:) select CAST(CAST('{"x" : 1}', 'Object(\'json\')'), 'Object(Nullable(\'json\'))')

SELECT CAST(CAST('{"x" : 1}', 'Object(\'json\')'), 'Object(Nullable(\'json\'))')

Query id: fb057b45-b72a-4d22-9b38-a3136cdf2465


0 rows in set. Elapsed: 0.002 sec.

Received exception from server (version 22.5.1):
Code: 53. DB::Exception: Received from localhost:9000. DB::Exception: Cast to Object can be performed only from flatten named Tuple, Map or String. Got: Object('json'): While processing CAST(CAST('{"x" : 1}', 'Object(\'json\')'), 'Object(Nullable(\'json\'))'). (TYPE_MISMATCH)
```

@CurtizJ what do you think?
{
        ElementWrappers element_wrappers;
        element_wrappers.reserve(from_element_types.size());
        
        for (size_t i = 0; i < from_element_types.size(); ++i)
        {
            const DataTypePtr & from_element_type = from_element_types[i];
            const DataTypePtr & to_element_type = to_element_types[i];
            element_wrappers.push_back(prepareUnpackDictionaries(from_element_type, to_element_type));
        }
        return element_wrappers;
    }
    WrapperType createTupleWrapper(const DataTypePtr & from_type_untyped, const DataTypeTuple * to_type) const