peter-toth commented on PR #7942:
URL: 
https://github.com/apache/arrow-datafusion/pull/7942#issuecomment-1870398974

   Thanks you all for the feedbacks! I've updated the PR description with the 
lastest findings.
   
   - With 1. and 2. let's wait for the new benchmarks 
https://github.com/apache/arrow-datafusion/issues/8638 and the `TreeNode` 
cleanup PR: https://github.com/apache/arrow-datafusion/pull/8653.
   - I discarded 3. as adding `Expr::Nop` isn't needed. We can use use 
`Expr::Literal(ScalarValue::Null)` where a dummy `Expr` is required: 
https://github.com/apache/arrow-datafusion/pull/7942#discussion_r1432926780
   - I extracted 4. into an issue: 
https://github.com/apache/arrow-datafusion/issues/8663 and opened a PR for it: 
https://github.com/apache/arrow-datafusion/pull/8664


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