public function compile()
{
if ($this->values instanceof CompilableInterface) {
$values = $this->values->compile();
} else {
if (0 == count($this->values)) {
throw new MissingValuesException("You must provide at least one value for the 'IN' expression!");
}
$values = implode(",", array_map(function ($element) {
return "\"{$element}\"";
}, $this->values));
}
return "{$this->field} IN ({$values})";
}