Apache Tajo v0.9 发布，此版本目标是优化传统 SQL 性能，改进 Tajo leading-edge 原生 SQL 支持；提高查询速度。 Apache Tajo v0.9 改进如下： - More comprehensive and powerful SQL capabilities, such as TIMESTAMP, DATE, TIME, and INTERVALtype support, as well as WINDOW functions, OVER clause support, and multiple distinct aggregation; - Performance improvements, such as offheap sort algorithm for ORDER BY and Runtime codegeneration for evaluating expressions push the boundaries of massive data query speeds; - Improvements to the hash shuffle I/O, boosting bottom-line speeds by 200-300% on "heavy",complex queries; - Enhanced Hadoop integration, including support for Hadoop 2.2.0 up to Hadoop 2.5.1, andexpanded Hive Metastore access; - Improved catalog backup and restore feature, as well as accessibility enhancements streamlineperformance across disparate technology environments.
Tajo 是一个分布式数据仓库系统，基于 Hadoop 实现，特点是低延迟、高可伸缩，提供专用查询和 ETL 工具 特点：
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