rubenada commented on PR #4208:
URL: https://github.com/apache/calcite/pull/4208#issuecomment-2676976866

   It seems to me that this comment in `Project#explainTerms` suggests that 
what we are discussing here was actually intended:
   ```
     @Override public RelWriter explainTerms(RelWriter pw) {
       ...
       // Skip writing field names so the optimizer can reuse the projects that 
differ in
       // field names only
   ```


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