presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/io/AccumuloPageSinkProvider.java/AccumuloPageSinkProvider/AccumuloPageSinkProvider
class AccumuloPageSinkProvider:    @Inject
    public AccumuloPageSinkProvider(
            Connector connector,
            AccumuloConfig config,
            AccumuloClient client)
    {
        this.client = requireNonNull(client, "client is null");
        this.connector = requireNonNull(connector, "connector is null");
        this.username = requireNonNull(config, "config is null").getUsername();
    }