Override ensureMyTable so we can control how this joins in. The operator actually has influence over joining.
Overrides HandlerBase::ensureMyTable
public function ensureMyTable() {
// Defer to helper if the operator specifies it.
$info = $this
->operators();
if (isset($info[$this->operator]['ensure_my_table']) && $info[$this->operator]['ensure_my_table'] == 'helper') {
return $this->helper
->ensureMyTable();
}
return parent::ensureMyTable();
}