Hello,

so I'm working to integrate CatBoost model with our ClickHouse cluster. It appears that, whenever we create a new XML model file in the configured path, the **first** call to the new model never returns (this is true both of the HTTP interface as well as via clickhouse-client).

Independently from whether the locked statement gets cancelled, subsequent calls succeed immediately.

```
16e8bdb5bbb9 :) select version();

SELECT version()

┌─version()─┐
│ 20.6.3.28 │
└───────────┘

1 rows in set. Elapsed: 0.006 sec.
```

Is this known behavior? If it helps, my models look like this:

```
<models>
    <model>
        <type>catboost</type>
        <name>ctr_predictor</name>
        <path>/catboost/my_predictor</path>
        <lifetime>0</lifetime>
    </model>
</models>
```
{
        if (forced_to_reload)
        {
            
            
            return next_id_counter;
        }
        
        
        
        auto it = min_id_to_finish_loading_dependencies.find(std::this_thread::get_id());
        if (it != min_id_to_finish_loading_dependencies.end())
            return it->second;
        
        
        return 1;
    }
    void startLoading(Info & info, bool forced_to_reload = false, size_t min_id_to_finish_loading_dependencies_ = 1)