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?
{
                serialization->serializeText(col_from, i, write_buffer, format_settings);
                write_helper.rowWritten();
            }
            write_helper.finalize();
        }
        if (result_type->isNullable() && null_map)
            return ColumnNullable::create(std::move(col_to), std::move(null_map));
        return col_to;
    }
};
/** Conversion of time_t to UInt16, Int32, UInt32
  */
template <typename DataType>
void convertFromTime(typename DataType::FieldType & x, time_t & time)
{
    x = time;
}
template <>
inline void convertFromTime<DataTypeDate>(DataTypeDate::FieldType & x, time_t & time)
{
    if (unlikely(time < 0))
        x = 0;
    else if (unlikely(time > 0xFFFF))
        x = 0xFFFF;
    else
        x = time;
}
template <>
inline void convertFromTime<DataTypeDate32>(DataTypeDate32::FieldType & x, time_t & time)