Get the arguments attached to the WHERE and HAVING clauses of this query.
function get_where_args() {
$args = array();
foreach ($this->where as $group => $where) {
$args = array_merge($args, $where['args']);
}
foreach ($this->having as $group => $having) {
$args = array_merge($args, $having['args']);
}
return $args;
}