MaxGekk commented on pull request #33889:
URL: https://github.com/apache/spark/pull/33889#issuecomment-911459861


   > ... , current code ignored the non-ansi mode . The behavior looks so 
strange.
   
   I cannot agree with that. ANSI intervals are new feature. We don't have any 
legacy user code which could require to support non-ANSI behavior. Everywhere 
in the new expressions, we have already implemented strong (ANSI mode). Now, 
you propose to add many new branches for non-ansi implementations. Should be a 
good reason for overcomplicating the code besides of "consistency" from your 
point of view.
   


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