如何从Cloud Bigtable中只读取一些列族？

import com.google.cloud.bigtable.hbase.BigtableConfiguration;
import org.apache.hadoop.hbase.client.*;

public class ReadFromBigtable {
    public static void main(String[] args) throws Exception {
        // 创建Bigtable连接配置
        Connection connection = BigtableConfiguration.connect("project-id", "instance-id");

        // 创建表名和过滤器
        TableName tableName = TableName.valueOf("table-name");
        Scan scan = new Scan();
        scan.addFamily(Bytes.toBytes("column-family1"));
        scan.addFamily(Bytes.toBytes("column-family2"));

        // 应用过滤器
        scan.setFilter(new FamilyFilter(CompareFilter.CompareOp.EQUAL, new BinaryComparator(Bytes.toBytes("column-family1"))));

        // 执行读取操作
        Table table = connection.getTable(tableName);
        ResultScanner scanner = table.getScanner(scan);
        for (Result result : scanner) {
            // 处理结果
        }

        // 关闭连接
        scanner.close();
        table.close();
        connection.close();
    }
}