src/DataTable.php
public function setGroupBy($column)
    {
        $this->groupBy = (isset($this->groupBy) ? $this->groupBy.',' : '').$column;

        return $this;
    }
public function setGroupBy($column)
    {
        $this->groupBy = (isset($this->groupBy) ? $this->groupBy.',' : '').$column;

        return $this;
    }
public function setGroupBy ( $ column ) { $ this -> groupBy = ( isset ( $ this -> groupBy ) ? $ this -> groupBy . ',' : '' ) . $ column ; return $ this ; }
Group by a SQL column

@param string $column

@return self
Group by a SQL column