报告题目：Major Technical Advancements in Apache Hive

报 告 人：王永胜

报告时间：2016年5月18日（周三） 下午 2:30

报告地点：贵州大学北校区博学楼603室

报告内容摘要：

In this paper , we use a new file format,optimized Record Columnar File(ORC File), has been added to hive which provides high storage and data access efficiency with low overhead.The query planning component has been updated with insightful analyses in complex reducing unnecessary operations in query plans.

报告题目：Plan Bouquets: Query Processing without Selectivity Estimation

报 告 人：张建峰

报告时间：2016年5月18日（周三） 下午 2:30

报告地点：贵州大学北校区博学楼603室

报告内容摘要：

 In this paper,we propose here a conceptually new approach to address this problem , wherein the compile-time estimation process is completely eschewed for error-prone selectivities.Instead , a small "bouquet" of plans isidentified from the set of optimal plans in query 's selectivity error space.