public function visitConcatInfixNode(ConcatInfixNode $node, Collector $collector)
{
$collector->append('CONCAT(');
parent::visit($node->getLeft(), $collector)->append(', ');
parent::visit($node->getRight(), $collector)->append(')');
return $collector;
}
protected function maybeVisit($thing, Collector $collector)
{
if (!$thing) {
return $collector;
}
$collector->append(' ');
return $this->visit($thing, $collector);
}