tencent cloud

public class MyDiff extends UDF {   
    public ArrayList<Integer> evaluate(ArrayList<Integer> input) {
        ArrayList<Integer> result = new ArrayList<Integer>();     
        result.add(0, 0);        
        for (int i = 1; i < input.size(); i++) {              
        result.add(i, input.get(i) - input.get(i - 1));        
        }      
        return result;    
    }
}

<dependencies>          
    <dependency>        
        <groupId>org.slf4j</groupId>        
            <artifactId>slf4j-log4j12</artifactId>       
            <version>1.7.16</version>        
            <scope>test</scope>    
        </dependency>    
        <dependency>        
            <groupId>org.apache.hive</groupId>        
            <artifactId>hive-exec</artifactId>        
            <version>1.2.1</version>    
        </dependency>
</dependencies>