/**
* Overriden with an aditional exclude parameter that tells not to include this expression (by default)
* in the select list.
*
* @param string $expression
*
* @param string $alias
*
* @param string $arguments
*
* @param string $exclude
* If set to TRUE, this expression will not be added to the select list. Useful
* when you want to reuse expressions in the WHERE part.
* @param string $expand
* If this expression will be expanded as a CROSS_JOIN so it can be consumed
* from other parts of the query. TRUE by default. It attempts to detect expressions
* that cannot be cross joined (aggregates).
* @return string
*/
public function addExpression($expression, $alias = NULL, $arguments = array(), $exclude = FALSE, $expand = TRUE) {
$alias = parent::addExpression($expression, $alias, $arguments);
$this->expressions[$alias]['exclude'] = $exclude;
$this->expressions[$alias]['expand'] = $expand;
return $alias;
}
