**Describe the bug**
Table creation with named tuples is broken

**How to reproduce**
ClickHouse server version 20.5.3.27

```
:) SELECT version();

┌─version()─┐
│ 20.5.3.27 │
└───────────┘
```
```
:) CREATE TABLE test.tuple
(
    `j` Tuple( a Int8, b String)
)
ENGINE = Memory;


Received exception from server (version 20.5.3):
Code: 62. DB::Exception: Received from localhost:9000. DB::Exception: Syntax error (data type): failed at position 9: Int8, b String). Expected one of: LIKE, GLOBAL NOT IN, AS, IS, OR, QuestionMark, BETWEEN, NOT LIKE, AND, Comma, alias, IN, Dot, NOT, Arrow, token, NOT IN, GLOBAL IN.
```
```
:) CREATE TABLE test.tuple_from_select
ENGINE = Memory AS
SELECT CAST((1, 'Test'), 'Tuple( a Int8,  b String)') AS j;


Received exception from server (version 20.5.3):
Code: 62. DB::Exception: Received from localhost:9000. DB::Exception: Syntax error (data type): failed at position 9: Int8, b String). Expected one of: LIKE, GLOBAL NOT IN, AS, IS, OR, QuestionMark, BETWEEN, NOT LIKE, AND, Comma, alias, IN, Dot, NOT, Arrow, token, NOT IN, GLOBAL IN.
```

**This works fine on 20.4.6.53:**
```
:) SELECT version();

┌─version()─┐
│ 20.4.6.53 │
└───────────┘
```
```
:) CREATE TABLE test.tuple
(
    `j` Tuple( a Int8, b String)
)
ENGINE = Memory;

Ok.
```
```
:) SHOW CREATE TABLE test.tuple

┌─statement───────────────────────────────────────────────────────────────────────┐
│ CREATE TABLE test.tuple
(
    `j` Tuple(
    a Int8, 
    b String)
)
ENGINE = Memory │
└─────────────────────────────────────────────────────────────────────────────────┘
```
```
:) CREATE TABLE test.tuple_from_select
ENGINE = Memory AS
SELECT CAST((1, 'Test'), 'Tuple( a Int8,  b String)') AS j;

Ok.
```
{
    
    if (create.temporary && !create.database.empty())
        throw Exception("Temporary tables cannot be inside a database. You should not specify a database for a temporary table.",
            ErrorCodes::BAD_DATABASE_FOR_TEMPORARY_TABLE);
    String current_database = context.getCurrentDatabase();
    
    if (create.attach && !create.storage && !create.columns_list)
    {
        auto database_name = create.database.empty() ? current_database : create.database;
        auto database = DatabaseCatalog::instance().getDatabase(database_name);
        bool if_not_exists = create.if_not_exists;
        
        auto query = database->getCreateTableQuery(create.table, context);
        create = query->as<ASTCreateQuery &>(); 
        create.attach = true;
        create.attach_short_syntax = true;
        create.if_not_exists = if_not_exists;
    }
    if (!create.temporary && create.database.empty())
        create.database = current_database;
    if (create.to_table_id && create.to_table_id.database_name.empty())
        create.to_table_id.database_name = current_database;
    if (create.select && (create.is_view || create.is_materialized_view || create.is_live_view))
    {
        AddDefaultDatabaseVisitor visitor(current_database);
        visitor.visit(*create.select);
    }