/**
  * Returns the list of low-level cassandra methods that require keyspace to
  * be selected.
  *
  * @return array
  */
 protected static function getKeyspaceRequiredMethods()
 {
     if (self::$keyspaceRequiredMethods === null) {
         self::$keyspaceRequiredMethods = array('login', 'get', 'get_slice', 'get_count', 'multiget_slice', 'multiget_count', 'get_indexed_slices', 'insert', 'remove', 'batch_mutate', 'truncate', 'describe_splits');
     }
     return self::$keyspaceRequiredMethods;
 }