protected function pushGroup()
    {
        if( $this->group ) {
            $this->parts[] = 'GROUP BY';
            $this->parts[] = $this->quoteIdentifierIfNotExpression($this->group);
        }
    }
protected function pushGroup()
    {
        if( $this->group ) {
            $this->parts[] = 'GROUP BY';
            $this->parts[] = $this->quoteIdentifierIfNotExpression($this->group);
        }
    }
protected function pushGroup ( ) { if ( $ this -> group ) { $ this -> parts [ ] = 'GROUP BY' ; $ this -> parts [ ] = $ this -> quoteIdentifierIfNotExpression ( $ this -> group ) ; } }
Push group by clause onto parts

@return void
Push group by clause onto parts