juntaozhang commented on PR #4353:
URL: https://github.com/apache/calcite/pull/4353#issuecomment-2868004411

   > this was pretty close, I hope we can finalize it. I think you need the 
nullif coercion
   
   I’m happy to hear from you. You said NULLIF should return the wider type, 
like the other coercions. But I’ve found it actually returns the type of the 
first argument, without coercion. It would be a big help if you could explain 
this, this will help me finish the PR.
   
   My related statement is outlined in my previous reply.
   
   


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