alamb commented on PR #18868:
URL: https://github.com/apache/datafusion/pull/18868#issuecomment-3598191388

   > I think the issue is knowing when a predicate is always true. If it's by 
statistics we need to make sure to handle truncated statistics, etc.
   
   The approach that @xudong963  has taken in this PR (and why 
https://github.com/apache/datafusion/pull/18970 is part of that)  is to negate 
the predicate and then use the existing pruning predicate machinery


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