pepijnve opened a new issue, #17972:
URL: https://github.com/apache/datafusion/issues/17972

   ### Is your feature request related to a problem or challenge?
   
   #15384 reverted an optimisation that was made in #11638. I believe there's a 
simple fix for the original problem that doesn't throw out the optimisation by 
avoiding evaluation of either the then or else expressions when the when vector 
is either all true or all false.
   
   ### Describe the solution you'd like
   
   _No response_
   
   ### Describe alternatives you've considered
   
   _No response_
   
   ### Additional context
   
   _No response_


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