presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/JdbcMetadataFactory.java/JdbcMetadataFactory/JdbcMetadataFactory
class JdbcMetadataFactory:    @Inject
    public JdbcMetadataFactory(JdbcClient jdbcClient, JdbcMetadataConfig config)
    {
        this.jdbcClient = requireNonNull(jdbcClient, "jdbcClient is null");
        requireNonNull(config, "config is null");
        this.allowDropTable = config.isAllowDropTable();
    }