使用RedisTemplate和Pipeline批量查询时返回值为空的原因是什么？如何解决这一问题？

// 错误示例：在pipeline内部处理结果
public <T> List<T> batchGetList(Collection<String> keys) {
    List<T> list = new ArrayList<>();
    // ... (省略代码)

    List<Object> results = redisTemplate.executePipelined(new RedisCallback<Object>() {
        @Override
        public Object doInRedis(RedisConnection connection) throws DataAccessException {
            for (String key : keys) {
                byte[] bytes = connection.get(keySerializer.serialize(key)); // 获取字节数组
                T value = (T) valueSerializer.deserialize(bytes); // 立即反序列化，错误！
                list.add(value); 
            }
            return null; // 返回null，pipeline结果被忽略
        }
    });
    return list; // 返回空列表
}

public <T> List<T> batchGetList(Collection<String> keys) {
    if (CollectionUtil.isEmpty(keys)) {
        return new ArrayList<>();
    }

    RedisSerializer<String> keySerializer = redisTemplate.getStringSerializer();
    RedisSerializer<T> valueSerializer = redisTemplate.getValueSerializer();

    List<byte[]> results = redisTemplate.executePipelined((RedisConnection connection) -> {
        for (String key : keys) {
            connection.get(keySerializer.serialize(key));
        }
        return null; // 返回null，pipeline结果在results中
    });

    return results.stream()
                  .map(bytes -> valueSerializer.deserialize(bytes))
                  .collect(Collectors.toList());
}