pepijnve commented on issue #18001:
URL: https://github.com/apache/datafusion/issues/18001#issuecomment-3393190020

   If we add this assertion, we're likely to see the same problem as #17813 pop 
up since the `coalesce` simplification introduced in #17357 currently violates 
the assertion. PR #17813 is an attempt to resolve that by ensuring the 
nullability of the original `coalesce` expression and the `case` based 
simplification output match.


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