presto-base-jdbc/src/main/java/io/prestosql/plugin/jdbc/JdbcMetadata.java/JdbcMetadata/JdbcMetadata
class JdbcMetadata:    public JdbcMetadata(JdbcClient jdbcClient, boolean allowDropTable)
    {
        this.jdbcClient = requireNonNull(jdbcClient, "client is null");
        this.allowDropTable = allowDropTable;
    }