Github user viirya commented on the issue:

    https://github.com/apache/spark/pull/13439
  
    Yea. That is right. The problem is whether it is worth doing this change 
for the memory usage reduction and performance gain. If the change is 
relatively small (another implementation, not current one), I think it might be 
worth. Current change is complicated as you said. Code generation seems too 
much for this. So you think this patch is not worth doing? Or let me update 
this to another implementation and then you take a look if it is worth?


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