public function down(Schema $schema)
{
$this->abortIf($this->connection->getDatabasePlatform()->getName() != "postgresql");
$this->addSql("DROP INDEX nodetypeindex");
$this->addSql("DROP INDEX identifierindex");
$this->addSql("DROP INDEX parentpath_sortingindex");
$this->addSql("ALTER TABLE typo3_typo3cr_domain_model_nodedata DROP parentpathhash");
}