Github user viirya commented on the issue:
https://github.com/apache/spark/pull/18931
@maropu Yes, I agreed. This PR changes the code-gen'd codes. It is not
going to detect the length of gen'd codes and decide to change codes or not.
It's because the generation of codes is a basically a single process in which
the calls to produce/consume is embedded as a whole. You don't have a break
there to check the length of codes.
It is important we need to check possibly performance downgrading and make
sure we don't do something wrong.
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