Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19813
I think all arithmetic, predicate and bitwise expressions can benefit from
it, and they are very common expressions in SQL. More importantly, allowing
expressions to output statement may have other benefits that we haven't
discovered yet, I don't think we should sacrifice it just for supporting
splitting code in whole stage codegen, which is only for performance not
stability.
For now I think we can fix the 64kb compile error caused by the whole stage
codegen framework not expressions. I remember @maropu has a PR to fix that and
I prefer to take priority to review that PR.
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