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pig

2009-08-09 16:10:38| 分类： dbms | 标签： |举报 |字号大中小订阅

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Pig 是yahoo捐献给apache的一个很有趣项目，它不是一个系统，而是一个类SQL语言, 具体目标是在MapReduce上构建的一种高级查询语言。目的是把一些运算编译进MapReduce模型的Map和Reduce中,允许用户可以自己的功能. Pig支持的很多代数运算、复杂数据类型（tuple,map)、统计运算（COUNT，SUM，AVG，MIN，MAX）和相关数据库检索运算（FILTER，GROUP BY，ORDER，DISTINCT，UNION，JOIN，FOREACH ... GENERATE）

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