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.
```
{
    auto table_id = getStorageID();
    checkAlterIsPossible(params, local_context);
    StorageInMemoryMetadata new_metadata = getInMemoryMetadata();
    params.apply(new_metadata, local_context);
    DatabaseCatalog::instance().getDatabase(table_id.database_name)->alterTable(local_context, table_id, new_metadata);
    setInMemoryMetadata(new_metadata);
}
void StorageDistributed::startup()
{
    if (remote_database.empty() && !remote_table_function_ptr)
        LOG_WARNING(log, "Name of remote database is empty. Default database will be used implicitly.");
    if (!storage_policy)
        return;
    for (const DiskPtr & disk : data_volume->getDisks())
        createDirectoryMonitors(disk);
    for (const String & path : getDataPaths())
    {
        UInt64 inc = getMaximumFileNumber(path);
        if (inc > file_names_increment.value)
            file_names_increment.value.store(inc);
    }
    LOG_DEBUG(log, "Auto-increment is {}", file_names_increment.value);
}
void StorageDistributed::shutdown()