**Describe what's wrong**

Creating a table with a Map-type Ephemeral column will make the server crash on the restart because of wrongly save metadata.

Fiddle to reproduce: https://fiddle.clickhouse.com/81fc3a83-f7ea-43c2-afad-2e2940d04e8c

**Does it reproduce on recent release?**

Tested on version 22.11.1.1286.

**How to reproduce**

* Use version 22.11.x
* Use the fiddle above to reproduce.

**Expected behavior**

When creating a `EPHEMERAL` columns, a default value is assigned.
Example with a Int32:
```sql
CREATE TABLE name (
  example_col Int32 EPHEMERAL
) -- ... engine stuff here ...
```

Metadata will assign a default value:
```sql
CREATE TABLE name (
  example_col Int32 EPHEMERAL 0
) -- ... engine stuff here ...
```

But, with Map-type, no default value gets assigned, only a `()` (empty parenthesis).

**Error message and/or stacktrace**

```
2022.12.07 14:59:29.359153 [ 11464597 ] {} <Error> Application: DB::Exception: Syntax error (in file /Users/vlourme/Desktop/ch/store/75e/75e717de-1bbd-4011-802c-acd04e9a3409/bug_ephemeral.sql): failed at position 118 ('(') (line 4, col 41): (),
    `result` Int32 DEFAULT (data['number']) * 2
)
ENGINE = MergeTree
ORDER BY id
SETTINGS index_granularity = 8192
. Expected one of: literal, NULL, number, Bool, true, false, string literal, NOT, COMMENT, CODEC, TTL, token, Comma, ClosingRoundBracket: Cannot parse definition from metadata file /Users/vlourme/Desktop/ch/store/75e/75e717de-1bbd-4011-802c-acd04e9a3409/bug_ephemeral.sql
```

**Additional context**

The issue can't be fixed by setting a default expression after `EPHEMERAL`, this, for example will not work:
```sql
CREATE TABLE bug_ephemeral (
    id Int32,
    data Map(String, Int32) EPHEMERAL {},
    result Int DEFAULT data['number'] * 2
)
Engine = MergeTree()
ORDER BY (id);
```

But this, is accepted:
```sql
CREATE TABLE bug_ephemeral (
    id Int32,
    data Int32 EPHEMERAL 12,
    result Int DEFAULT data * 2
)
Engine = MergeTree()
ORDER BY (id);
```

|| create.storage->engine->name == "MaterializedPostgreSQL")
    {
        if (create.attach && create.uuid == UUIDHelpers::Nil)
            throw Exception(ErrorCodes::INCORRECT_QUERY, "UUID must be specified for ATTACH. "
                            "If you want to attach existing database, use just ATTACH DATABASE {};", create.getDatabase());
        else if (create.uuid == UUIDHelpers::Nil)
            create.uuid = UUIDHelpers::generateV4();
        metadata_path = metadata_path / "store" / DatabaseCatalog::getPathForUUID(create.uuid);
        if (!create.attach && fs::exists(metadata_path))
            throw Exception(ErrorCodes::DATABASE_ALREADY_EXISTS, "Metadata directory {} already exists", metadata_path.string());
    }
    else if (create.storage->engine->name == "MaterializeMySQL"
        || create.storage->engine->name == "MaterializedMySQL")
    {
        
        
        
        
        bool attach_from_user = create.attach && !internal && !create.attach_short_syntax;
        bool create_from_user = !create.attach;
        if (create_from_user)
        {
            if (create.uuid == UUIDHelpers::Nil)
                create.uuid = UUIDHelpers::generateV4();    
        }
        else if (attach_from_user && create.uuid == UUIDHelpers::Nil)
        {
            
            
            throw Exception("Use short attach syntax ('ATTACH DATABASE name;' without engine) to attach existing database "