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                Spark SQL的前身是Shark,設計目標是作為Hive的一個補充。其缺陷是:對Hive的改造,繼承了大量Hive代碼,給優化和維護帶來了大量的麻煩,所以Spark拋棄了Shark 原有的架構,單獨開發出了Spark SQL,它汲取了 Shark 的一些優點,除了覆蓋 Shark 的所有功能外,還提供了 SQL DSL API 和靈活的程序擴展,擺脫了對 Hive 的依賴。
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