For some reasons when we delete a MergeTree Part in atomic way something may go wrong - and leave the `delete_tmp_*` folder or it's part on disk. This may lead to a disk space consumption over time.

It's suggested to delete this folders at least at server start-up. Current solution with `clearOldTemporaryDirectories()` doesn't work because this method is called periodically from a thread without any locks or advisory on folders - it may cause the race conditions.
if (!covering_drop_range.empty())
        {
            LOG_TRACE(log, "{} {}: it's covered by DROP_RANGE {}", log_msg_context, part_name, covering_drop_range);
            return true;
        }
        
        
        
        String covering_get_part_entry = get_part_set.getContainingPart(part_name);
        if (covering_get_part_entry.empty())
            return false;
        if (covering_get_part_entry != part_name)
        {
            LOG_TRACE(log, "{} {}: it's covered by GET_PART {}", log_msg_context, part_name, covering_get_part_entry);
            return true;
        }
        
        
        
        
        
        if (created_gets.contains(part_name))
        {
            
            
            
            LOG_TRACE(log, "{} {}: GET_PART for it is already created", log_msg_context, part_name);
            return true;
        }
        return false;