presto-raptor-legacy/src/main/java/io/prestosql/plugin/raptor/legacy/RaptorConnector.java/RaptorConnector/rollback
class RaptorConnector:    @Override
    public void rollback(ConnectorTransactionHandle transaction)
    {
        RaptorMetadata metadata = transactions.remove(transaction);
        checkArgument(metadata != null, "no such transaction: %s", transaction);
        finishDelete(((RaptorTransactionHandle) transaction).getUuid());
        metadata.rollback();
    }