**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.


{
    std::shared_ptr<ASTExpressionList> columns_list = std::static_pointer_cast<ASTExpressionList>(formatColumns(columns));
    for (const auto & alias_column : alias_columns)
    {
        const auto column_declaration = std::make_shared<ASTColumnDeclaration>();
        column_declaration->name = alias_column.name;
        ParserDataType type_parser;
        String type_name = alias_column.type->getName();
        const char * type_pos = type_name.data();
        const char * type_end = type_pos + type_name.size();
        column_declaration->type = parseQuery(type_parser, type_pos, type_end, "data type", 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
        column_declaration->default_specifier = "ALIAS";
        const auto & alias = alias_column.expression;
        const char * alias_pos = alias.data();
        const char * alias_end = alias_pos + alias.size();
        ParserExpression expression_parser;
        column_declaration->default_expression = parseQuery(expression_parser, alias_pos, alias_end, "expression", 0, DBMS_DEFAULT_MAX_PARSER_DEPTH);
        columns_list->children.emplace_back(column_declaration);
    }
    return columns_list;
}
ASTPtr InterpreterCreateQuery::formatColumns(const ColumnsDescription & columns)