comphead commented on PR #17991:
URL: https://github.com/apache/datafusion/pull/17991#issuecomment-3386640529

   > Regarding the plan change, the alternative in #17997 avoids the plan 
change by letting the `nvl` implementation handle lazy evaluation itself.
   
   
   Thanks @pepijnve I think we can document it for now in user doc, that NVL is 
lazily evaluated
   
   ```
   pub struct NVLFunc
   ```
   
   
   


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