wojustme commented on pull request #2742:
URL: https://github.com/apache/calcite/pull/2742#issuecomment-1067629421


   @NobiGo 
   The `sales.emp`'s field of sal is not-null, the condition of `sal is null` 
always return `FALSE` in these cases.
   Extracting the constants will fail, after simplifying rexnode
   So, this test case may be not rigorous.
   


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