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                Catalyst優化器是Spark SQL的核心,Catalyst Optimizer(Catalyst優化器)將Spark SQL的 **邏輯計劃** 轉為可執行的 **物理計劃**,即Catalyst優化器將SQL類似的 Spark 程序代碼被 Spark Core 調度執行,其過程也有 Job、Stage、Task 的概念。 :-: ![](https://img.kancloud.cn/a0/c4/a0c4377187d5eadd4bff522d6902398d_1115x406.png) Catalyst轉換過程 例如有下面的SQL: ```sql SELECT name FROM ( SELECT id, name FROM people ) p WHERE p.id = 1 ``` 優化過程: (1)在投影上面查詢過濾器 (2)檢查過濾是否可下壓 :-: ![](https://img.kancloud.cn/f1/12/f112e6e6448f60cce4e224cda0bef6cf_700x301.png) Catalys優化過程
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