Github user kiszk commented on the issue:
https://github.com/apache/spark/pull/18257
@dongjoon-hyun thank you. IMHO, the codegen can handle the first point.
However, the second and third points make sense. The codegen cannot achieve.
Finally, it seems to be design decision about what is the Catalyst
optimizer role. Only optimization, or optimization and correctness.
I would like to hear opinions of @cloud-fan and @gatorsmile, too.
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