Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/19082
The latest regression (introduced by `spark.sql.codegen.hugeMethodLimit`)
clearly shows the ring/onion/horizontal cut
(https://github.com/apache/spark/pull/18931) could introduce a performance
regression.
Vertical cuts like this PR is more promising. However, it still does not
resolve all the performance regressions introduced by
`spark.sql.codegen.hugeMethodLimit`
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