jayzhan211 commented on issue #11274:
URL: https://github.com/apache/datafusion/issues/11274#issuecomment-2211569477

   Another thing to note that is the `nullability` of the function is different 
from the final result but the information for optimizer.
   
   We can still tell optimizer that the function is always non-null and do the 
optimization based on this information. We can still get `null` as the final 
result as no row qualifies, so we get the empty plan which is null value.
   
   https://github.com/apache/datafusion/pull/11093#issuecomment-2188857213


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