研究论文：
# Vigna, Sebastiano. "Broadword implementation of rank/select queries." In International Workshop on Experimental and Efficient Algorithms, WEA 2008.
= 基数估计 =
基数估计（Cardinality Estimation），评估一个集合中不同数据项的个数的近似算法。比如，访问一个网站的独立IP个数。
* [https://github.com/Microsoft/CardinalityEstimation Cardinality Estimation Algorithm]
# Flajolet, Philippe, Éric Fusy, Olivier Gandouet, and Frédéric Meunier. "Hyperloglog: the analysis of a near-optimal cardinality estimation algorithm." DMTCS Proceedings 1 (2008).
# Heule, Stefan, Marc Nunkesser, and Alexander Hall. "HyperLogLog in practice: algorithmic engineering of a state of the art cardinality estimation algorithm." In Proceedings of the 16th International Conference on Extending Database Technology, pp. 683-692. ACM, 2013.
=大数据解析平台基数估计 =大数据解析平台，是实现数据解析的分布式软件系统。
基数估计（Cardinality Estimation），评估一个集合中不同数据项的个数的近似算法。比如，访问一个网站的独立IP个数。 * [httphttps://kylingithub.io Apache Kylincom/Microsoft/CardinalityEstimation Cardinality Estimation Algorithm]* [http# Flajolet, Philippe, Éric Fusy, Olivier Gandouet, and Frédéric Meunier. "Hyperloglog://druidthe analysis of a near-optimal cardinality estimation algorithm." DMTCS Proceedings 1 (2008).# Heule, Stefan, Marc Nunkesser, and Alexander Hall. "HyperLogLog in practice: algorithmic engineering of a state of the art cardinality estimation algorithm." In Proceedings of the 16th International Conference on Extending Database Technology, pp. 683-692. ACM, 2013.io/ Druid]