21.11.3.6
```
cat /etc/clickhouse-server/node.tsv
1,test

cat /etc/clickhouse-server/node_dictionary.xml
<dictionaries>
    <dictionary>
        <name>node</name>
        <source>
            <file>
                <path>/etc/clickhouse-server/node.tsv</path>
                <format>CSV</format>
            </file>
        </source>
        <lifetime>0</lifetime>
        <layout><flat /></layout>
        <structure>
            <id><name>key</name></id>
            <attribute>
                <name>name</name>
                <type>String</type>
                <null_value></null_value>
            </attribute>
        </structure>
    </dictionary>
</dictionaries>

create table default.node ( key UInt64, name String ) Engine=Dictionary(node);

select * from default.node;
┌─key─┬─name─┐
│   1 │ test │
└─────┴──────┘

/etc/init.d/clickhouse-server restart

<Error> Application: DB::Exception: Cannot attach 1 tables due to cyclic dependencies. See server log for details.
<Information> Application: shutting down
```
ContextPtr ,
    const String & table_name,
    bool )
{
    std::unique_lock lock{mutex};
    auto table = detachTableUnlocked(table_name, lock);
    try
    {
        
        
        
        
        SCOPE_EXIT(lock.lock());
        lock.unlock();
        table->drop();
        if (table->storesDataOnDisk())
        {
            assert(database_name != DatabaseCatalog::TEMPORARY_DATABASE);
            fs::path table_data_dir{getTableDataPath(table_name)};
            if (fs::exists(table_data_dir))
                fs::remove_all(table_data_dir);
        }
    }
    catch (...)
    {
        assert(database_name != DatabaseCatalog::TEMPORARY_DATABASE);
        attachTableUnlocked(table_name, table, lock);
        throw;
    }