protected function buildGroupBy()/*# : array */
    {
        $result = [];
        foreach ($this->clause_groupby as $grp) {
            $result[] = $grp[0] ? $grp[1] : $this->quote($grp[1]);
        }
        return $result;
    }
protected function buildGroupBy()/*# : array */
    {
        $result = [];
        foreach ($this->clause_groupby as $grp) {
            $result[] = $grp[0] ? $grp[1] : $this->quote($grp[1]);
        }
        return $result;
    }
protected function buildGroupBy ( ) /*# : array */ { $ result = [ ] ; foreach ( $ this -> clause_groupby as $ grp ) { $ result [ ] = $ grp [ 0 ] ? $ grp [ 1 ] : $ this -> quote ( $ grp [ 1 ] ) ; } return $ result ; }
Build GROUP BY

@return array
@access protected
Build GROUP BY