public function down(Schema $schema)
{
$this->abortIf($this->connection->getDatabasePlatform()->getName() != "postgresql");
$this->addSql("ALTER TABLE typo3_typo3cr_domain_model_nodedata ALTER dimensionvalues DROP NOT NULL");
$this->addSql("ALTER TABLE typo3_typo3cr_domain_model_nodedata ALTER properties DROP NOT NULL");
$this->addSql("ALTER TABLE typo3_typo3cr_domain_model_nodedata ALTER accessroles DROP NOT NULL");
}