rgbuilds commented on PR #26104:
URL: https://github.com/apache/datafusion/pull/26104#issuecomment-6074177065

   I also reproduced a related case where both files contain struct `s`, but 
only one contains its required child `s.y`. On both base and head, `s.y` is 
still inferred as non-nullable: selecting it fails when the missing value is 
filled with `NULL`, and `WHERE s.y IS NULL` incorrectly returns no rows.
   
   Would it be useful to track this separately? I’d be happy to open an issue 
with the reproducer and investigate further.


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