lib/Sirel/SelectManager.php
function group($expr)
    {
        if (null === $expr) {
            $this->nodes->groups = array();
        } else {
            $this->nodes->groups[] = new Group($expr);
        }
        return $this;
    }
function group($expr)
    {
        if (null === $expr) {
            $this->nodes->groups = array();
        } else {
            $this->nodes->groups[] = new Group($expr);
        }
        return $this;
    }
function group ( $ expr ) { if ( null === $ expr ) { $ this -> nodes -> groups = array ( ) ; } else { $ this -> nodes -> groups [ ] = new Group ( $ expr ) ; } return $ this ; }
Adds a Group expression
@param  mixed $expr
@return SelectManager
Adds a Group expression