數據虛擬化系統 Teiid 7.6 CR1 發布

Teiid是一個數據虛擬化系統，讓應用程序使用來自多個異構數據存儲的數據。

Teiid由一堆工具，組件和創建和執行雙向數據的服務所組成。通過抽象和聯合、數據存取和集成的實時分布式數據源，無需進行復制或以其他方式移動數據系統的紀錄。
項目地址：http://www.jboss.org/teiid

Teiid 7.6 CR1 發布了，修復了前一版本的 bug 外，還包含如下新特性：

• View removal hint - the NO_UNNEST hint now also applies to FROM  clause views and subqueries. It will instruct the planner to not perform view flattening.
• Non-blocking statement execution - Teiid JDBC extensions TeiidStatement and TeiidPreparedStatement can be used to submit queries against embedded connections with a callback to process results in a non-blocking manner.
• NON_STRICT limit hint - the NON_STRICT hint can be used with unordered limits to tell the optimizer to not inhibit push operations even if the results will not be consistent with the logical application of the limit.
• Source Hints - user and transformation queries can specify a meta source hint, e.g. SELECT /*+ sh my-oracle:'leading' */ * FROM TBL. The hint information will be passed to the translator. The Oracle translator will by default treat the source hint as an Oracle hint.  See the Reference and Developers Guide for more.
• Hive Translator - Hive translator has been added as a technology preview.