<ruby id="bdb3f"></ruby>

    <p id="bdb3f"><cite id="bdb3f"></cite></p>

      

      <p id="bdb3f"><cite id="bdb3f"><th id="bdb3f"></th></cite></p><p id="bdb3f"></p>
        <p id="bdb3f"><cite id="bdb3f"></cite></p>
          

          <pre id="bdb3f"></pre>
          <pre id="bdb3f"><del id="bdb3f"><thead id="bdb3f"></thead></del></pre>
          

          <ruby id="bdb3f"><mark id="bdb3f"></mark></ruby><ruby id="bdb3f"></ruby>
          <pre id="bdb3f"><pre id="bdb3f"><mark id="bdb3f"></mark></pre></pre><output id="bdb3f"></output><p id="bdb3f"></p><p id="bdb3f"></p>
          

          <pre id="bdb3f"><del id="bdb3f"><progress id="bdb3f"></progress></del></pre>
                <ruby id="bdb3f"></ruby>
                
    


                
  
                                            
                                          
        
                
          ??一站式輕松地調用各大LLM模型接口，支持GPT4、智譜、豆包、星火、月之暗面及文生圖、文生視頻
          廣告
        
                        
                                                          
  

                

                
    
                
        
                
                            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
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







                  <ruby id="bdb3f"></ruby>
                  <p id="bdb3f"><cite id="bdb3f"></cite></p>
                    

                    <p id="bdb3f"><cite id="bdb3f"><th id="bdb3f"></th></cite></p><p id="bdb3f"></p>
                      <p id="bdb3f"><cite id="bdb3f"></cite></p>
                        

                        <pre id="bdb3f"></pre>
                        <pre id="bdb3f"><del id="bdb3f"><thead id="bdb3f"></thead></del></pre>
                        

                        <ruby id="bdb3f"><mark id="bdb3f"></mark></ruby><ruby id="bdb3f"></ruby>
                        <pre id="bdb3f"><pre id="bdb3f"><mark id="bdb3f"></mark></pre></pre><output id="bdb3f"></output><p id="bdb3f"></p><p id="bdb3f"></p>
                        

                        <pre id="bdb3f"><del id="bdb3f"><progress id="bdb3f"></progress></del></pre>
                              <ruby id="bdb3f"></ruby>
                              

哎呀哎呀视频在线观看