Github user inouehrs commented on the issue: https://github.com/apache/spark/pull/13539 @cloud-fan @davies Thank you so much for the comments. I agree that my implementation is hacky. I tried to do optimization without adding members in ExprCode or Expression. I look for a less-hacky way. (BTW, my original motivation is to eliminate zeroOutNullBytes from the inner-most loop for better optimization in Java JIT compiler. It seems that zeroOutNullBytes affected the performance by few percents for simple map operation.)
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