Github user kiszk commented on the issue:

    https://github.com/apache/spark/pull/19916
  
    @mgaido91 I am asking the following code. This code will be translated to 
the native code. However, this code does not make any affect to `testWithCast` 
and `testWithoutCast`.  
    Did you confirm that this measurement does not include the JIT compilation 
time?
    
    ```
       // warmup cycle
       Long b = 0L;
       for(long i = 0; i < 1000000000; ++ i){
         b += al;
       }
    ```



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