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 auto & settings = local_context->getSettingsRef();
    
    if (!storage_policy && !owned_cluster && !settings.insert_distributed_sync && !settings.insert_shard_id)
    {
        throw Exception("Storage " + getName() + " must have own data directory to enable asynchronous inserts",
                        ErrorCodes::BAD_ARGUMENTS);
    }
    auto shard_num = cluster->getLocalShardCount() + cluster->getRemoteShardCount();
    
    if (!settings.insert_shard_id && !settings.insert_distributed_one_random_shard && !has_sharding_key && shard_num >= 2)
    {
        throw Exception(
            "Method write is not supported by storage " + getName() + " with more than one shard and no sharding key provided",
            ErrorCodes::STORAGE_REQUIRES_PARAMETER);
    }
    if (settings.insert_shard_id && settings.insert_shard_id > shard_num)
    {
        throw Exception("Shard id should be range from 1 to shard number", ErrorCodes::INVALID_SHARD_ID);
    }
    
    bool insert_sync = settings.insert_distributed_sync || settings.insert_shard_id || owned_cluster;
    auto timeout = settings.insert_distributed_timeout;
    
    return std::make_shared<DistributedBlockOutputStream>(
        local_context, *this, metadata_snapshot,
        createInsertToRemoteTableQuery(
            remote_database, remote_table, metadata_snapshot->getSampleBlockNonMaterialized()),
        cluster, insert_sync, timeout);
}
QueryPipelinePtr StorageDistributed::distributedWrite(const ASTInsertQuery & query, ContextPtr local_context)