jackwener commented on PR #4842:
URL: 
https://github.com/apache/arrow-datafusion/pull/4842#issuecomment-1374786211

   > > e.g: some rule recurse inside themselves, and alway return Ok(Some())
   > > It's expected behavior.
   > 
   > Why don't we return None if the rule can't optimize the plan is this 
scenario?
   
   Some rule I modify them to avoid self-recurse, those rules is ok. But other 
rules still use original code, always return Ok(Some())


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