/**
* Creates an instance of binary expression node, representing the construction: subject + value
*
* @param mixed $subject logical subject
* @param mixed $value value to add to the subject
*
* SQL example:
* @code
* // "cost" + 2
* Expression::add("cost", 2);
* @endcode
* @return BinaryExpression
*/
static function add($subject, $value)
{
return new BinaryExpression($subject, BinaryLogicalOperator::add(), $value);
}
