Kimahriman commented on PR #40085:

   > Could you show the mainstream databases support the function?
   I didn't pull this from anywhere else, I just made it up to address a 
performance limitation with subexpression elimination which still exists after 
2 years and several PRs trying to address. Don't love the name but couldn't 
think of a better one.
   @cloud-fan curious your thoughts on this. It's a slightly different approach 
to solving the same issue as your `NullIf` improvement with the new `With` 
clause, but for arbitrary condition expressions on a value, not just exact 
equals. Almost like `NullWhen`. If any of the conditional subexpression 
eliminations PRs ever get merged or your `With` work eventually covers this use 
case might not be necessary anymore. 

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