**Describe what's wrong**

We have a nested field in a table.
The table is created using SET flatten_nested = 0.
When the server is restarted the field is no longer nested (only flattened arrays appear).

**Does it reproduce on recent release?**

version 22.2.3.1

**How to reproduce**

Create a table using:

` 
SET flatten_nested = 0            
` 
` 
CREATE TABLE test.test    
    (     
        id String,  
       nested_field Nested (nf1 String, nf2 String)  
    ) ENGINE = MergeTree ORDER BY id  
`

Recover the table structure using describe:
`
describe test.test
`
`
name           type
id             String
nested_field   Nested(nf1 String, nf2 String) 
`

Restart click-house server.

Recover the table structure using describe:
`
 name               type            
 id                 String                                                                                          
 nested_field.nf1   Array(String)                                                                                   
 nested_field.nf2   Array(String)                                                                                   
`

*Expected behavior**

Recover the initial structure of the table not he flatenned one.


{
    if (create.as_table_function)
        return;
    if (create.is_dictionary || create.is_ordinary_view || create.is_live_view || create.is_window_view)
        return;
    if (create.is_materialized_view && create.to_table_id)
        return;
    if (create.temporary)
    {
        if (create.storage && create.storage->engine && create.storage->engine->name != "Memory")
            throw Exception(ErrorCodes::INCORRECT_QUERY, "Temporary tables can only be created with ENGINE = Memory, not {}",
                create.storage->engine->name);
        
        
        
        
        if (create.storage && !create.storage->engine)
            throw Exception(ErrorCodes::INCORRECT_QUERY, "Invalid storage definition for temporary table: must be either ENGINE = Memory or empty");
        auto engine_ast = std::make_shared<ASTFunction>();
        engine_ast->name = "Memory";
        engine_ast->no_empty_args = true;
        auto storage_ast = std::make_shared<ASTStorage>();
        storage_ast->set(storage_ast->engine, engine_ast);
        create.set(create.storage, storage_ast);