HaoYang670 commented on PR #4842:
URL: 
https://github.com/apache/arrow-datafusion/pull/4842#issuecomment-1374763405

   Thank you for your review @jackwener and @alamb 😁.
   
   > Sometimes, plan didn't changed, some rule also will return Ok(Some()).
   e.g: some rule recurse inside themselves, and alway return Ok(Some())
   
   Hi @jackwener, is this the expected behavior or a known bug that hasn't been 
fixed yet?


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