presto-spi/src/main/java/io/prestosql/spi/connector/ConnectorMetadata.java/ConnectorMetadata/getCommonPartitioningHandle
class ConnectorMetadata:    default Optional<ConnectorPartitioningHandle> getCommonPartitioningHandle(ConnectorSession session, ConnectorPartitioningHandle left, ConnectorPartitioningHandle right)
    {
        if (left.equals(right)) {
            return Optional.of(left);
        }
        return Optional.empty();
    }