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.
```
extern const Event DistributedRejectedInserts;
    extern const Event DistributedDelayedInserts;
    extern const Event DistributedDelayedInsertsMilliseconds;
}
namespace DB
{
namespace ErrorCodes
{
    extern const int LOGICAL_ERROR;
    extern const int NOT_IMPLEMENTED;
    extern const int STORAGE_REQUIRES_PARAMETER;
    extern const int BAD_ARGUMENTS;
    extern const int NUMBER_OF_ARGUMENTS_DOESNT_MATCH;
    extern const int INCORRECT_NUMBER_OF_COLUMNS;
    extern const int INFINITE_LOOP;
    extern const int TYPE_MISMATCH;
    extern const int TOO_MANY_ROWS;
    extern const int UNABLE_TO_SKIP_UNUSED_SHARDS;
    extern const int INVALID_SHARD_ID;
    extern const int ALTER_OF_COLUMN_IS_FORBIDDEN;
    extern const int DISTRIBUTED_TOO_MANY_PENDING_BYTES;
    extern const int ARGUMENT_OUT_OF_BOUND;
}
namespace ActionLocks
{
    extern const StorageActionBlockType DistributedSend;
}
namespace
{
ASTPtr rewriteSelectQuery(const ASTPtr & query, const std::string & database, const std::string & table, ASTPtr table_function_ptr = nullptr)