1fanwang commented on code in PR #25767:
URL: https://github.com/apache/datafusion/pull/25767#discussion_r4284741633


##########
datafusion/sqllogictest/test_files/intersection.slt:
##########
@@ -42,3 +42,150 @@ query IR
 SELECT int_col, double_col FROM alltypes_plain where int_col > 0 INTERSECT 
SELECT int_col, double_col FROM alltypes_plain
 ----
 1 10.1
+
+# INTERSECT ALL keeps min(m, n) copies of each row and EXCEPT ALL keeps
+# max(m - n, 0), with NULLs compared as equal.
+statement ok

Review Comment:
   Done in 
https://github.com/apache/datafusion/commit/7bed929728501f58542fa1b47df408ae6681aa47.
 Empty left, empty right and both empty are now covered.



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