code: public function remove(array $identifier, $shardingKey = null)
      {
          $this->schemaManager->remove(
              $this->tableName,
              array_merge(
                  $this->mapIdentifier($identifier),
                  array($this->nameField=>array_keys($this->fields))
              ),
              $shardingKey
          );
  
          return $this;
      }
docs: @param array $identifier
  @param null  $shardingKey
  
  @return $this