HyukjinKwon commented on PR #59283:
URL: https://github.com/apache/spark/pull/59283#issuecomment-6175659937

   Thanks, verified on the current head. Nested updates now replace the 
resolved parent by ordinal, and the new test checks results and schemas for 
both case-sensitivity transitions on a DataFrame and a temp view. The 
three-part withField/dropFields test on a nondeterministic input runs on the 
interpreted, codegen-only and whole-stage paths with the method-split threshold 
at 1. optimizeFieldOps now collects each parent's nested operations and 
optimizes them once, and the 2,000-update test bounds the merge to linear 
visits.
   
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