Github user viirya commented on the issue:
https://github.com/apache/spark/pull/19813
I wrote a design doc at
https://paper.dropbox.com/doc/Split-deeply-nested-expressions-under-wholestage-codegen-WXkQ9iIlN3zkGdn8MHgiW
The design is based on what did in this PR.
Please give me feedbacks if you have time to go through it. Thank you.
cc @cloud-fan @kiszk @mgaido91 @maropu @gatorsmile
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