Github user maropu commented on the issue:
https://github.com/apache/spark/pull/19082
Either way, I think we first need to know why the regression on `q66`
happens when turning off wholestage codegen. We first thought turning off
too-long functions had better performance, but it is not always true. Also, we
better know if this regression happens on other JVM impls, too. Next, I'll look
into these issues.
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