twalthr commented on PR #24526:
URL: https://github.com/apache/flink/pull/24526#issuecomment-2124641140

   This is indeed a tricky one. I also spend a significant amount of time here. 
Every vendor does it differently. I looked also at programming languages such 
as PHP, C#. For example, C# removes duplicates.
   
   In general, having an INTERSECT on array types sounds weird. Intersection is 
a concept from set theory:
   https://en.wikipedia.org/wiki/Intersection_(set_theory)
   
   But arrays are not sets. Since we also deduplicate unions (another term from 
set theory), I would vote for deduplicate.
   
   


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