public function get($identifier) : ColumnInterface
    {
        if (false === $this->has($identifier)) {
            throw new ColumnNotFoundException($identifier);
        }

        return $this->items[$identifier];
    }
public function get($identifier) : ColumnInterface
    {
        if (false === $this->has($identifier)) {
            throw new ColumnNotFoundException($identifier);
        }

        return $this->items[$identifier];
    }
public function get ( $ identifier ) : ColumnInterface { if ( false === $ this -> has ( $ identifier ) ) { throw new ColumnNotFoundException ( $ identifier ) ; } return $ this -> items [ $ identifier ] ; }
Returns column by its identifier

@param string $identifier Column identifier

@return ColumnInterface
Returns column by its identifier