function op_simple() {
if (empty($this->value)) {
return;
}
$this
->ensureMyTable();
// We use array_values() because the checkboxes keep keys and that can cause
// array addition problems.
$this->query
->add_where($this->options['group'], "{$this->tableAlias}.{$this->realField}", array_values($this->value), $this->operator);
}