The only way to use this feature is to specify an empty database name in Distributed table definition, but then you get a warning:

```
CREATE TABLE `demo_loan_all` (...) ENGINE=Distributed(test_cluster_two_shards_different_databases, '', demo_loan_01568, cityHash64(id));

<Warning> StorageDistributed (demo_loan_all): Name of remote database is empty. Default database will be used implicitly.
```
{
    const std::string path(disk->getPath() + relative_data_path);
    Poco::File{path}.createDirectories();
    std::filesystem::directory_iterator begin(path);
    std::filesystem::directory_iterator end;
    for (auto it = begin; it != end; ++it)
    {
        const auto & dir_path = it->path();
        if (std::filesystem::is_directory(dir_path))
        {
            const auto & tmp_path = dir_path / "tmp";
            
            if (std::filesystem::is_directory(tmp_path) && std::filesystem::is_empty(tmp_path))
                std::filesystem::remove(tmp_path);
            if (std::filesystem::is_empty(dir_path))
            {
                LOG_DEBUG(log, "Removing {} (used for async INSERT into Distributed)", dir_path.string());
                
                std::filesystem::remove(dir_path);
            }
            else
            {
                requireDirectoryMonitor(disk, dir_path.filename().string());
            }
        }
    }
}
StorageDistributedDirectoryMonitor& StorageDistributed::requireDirectoryMonitor(const DiskPtr & disk, const std::string & name)