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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