Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19813
> it also means the chained evaluation of expressions needs to be run at
every occurrence.
We can introduce some mechanism to save statement to local variables if
it's going to be re-computed. A possible benefit is reducing code size. Anyway
I think this is a valid possibility to improve the codegen framework and we
should not totally give it up.
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