Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/21537
It's a good point that we should have a design doc for this codegen
infrastructure improvement, since it's very critical to Spark. And we should
have it reviewed by the community.
There were some discussions on the PRs and JIRAs, but it didn't happen in
the dev list. This is something we should do next.
At this stage, I think it's too late to revert anything related to the
codegen improvement. There are so many codegen templates get touched and I
think reverting is riskier.
But we should hold it now until the design doc is reviewed by the community
in dev list.
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