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                            根據用戶定義的函數類可以分為如下三種：
* UDF（User-Defined-Function）：自定義標準函數
    * 特點：一進一出

* UDAF（User-Defined  Aggregation Function）：自定義聚合函數
    * 特點：多進一出，類似`count/max/min`等函數

* UDTF（User-Defined Table-Generating Functions）：自定義表生成函數
    * 特點：一進多出，類似`lateral view explore()`函數

                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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