joroKr21 commented on code in PR #15149:
URL: https://github.com/apache/datafusion/pull/15149#discussion_r1996627243


##########
datafusion/sqllogictest/test_files/array.slt:
##########
@@ -6232,12 +6244,12 @@ select array_intersect(arrow_cast([1, 1, 2, 2, 3, 3], 
'LargeList(Int64)'), null)
 query ?
 select array_intersect(null, [1, 1, 2, 2, 3, 3]);
 ----
-NULL
+[]

Review Comment:
   Above we have
   ```
   query ?
   select array_intersect([1, 1, 2, 2, 3, 3], null);
   ----
   []
   ```
   
   So I think it's better that `array_intersect` is commutative. I can make 
both `null` or both empty list but I think it should be the same if we flip the 
arguments. Which one should it be?



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