Github user ioana-delaney commented on the issue: https://github.com/apache/spark/pull/13570 @hvanhovell Thank you for reviewing the changes and I apologize for the delay in replying. I simplified the code. However, I don't think this is what you suggested. What you suggested I believe, was to pull out the rewrite of the inner expressions into an outer loop. I made a few attempts but I could not find a way to decouple the expressions' generation from the new plans' generation. When rewriting the expression, I am also building the plans bottom-up. Please take a look at my new changes and advise. Thanks!
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