gianm commented on code in PR #5369:
URL: https://github.com/apache/calcite/pull/5369#discussion_r4418629557


##########
core/src/test/resources/sql/set-op.iq:
##########
@@ -186,6 +186,23 @@ except
 
 !ok
 
+# [CALCITE-7901] UnionMergeRule merges EXCEPT ALL into an enclosing EXCEPT 
DISTINCT.
+# One of the two 1s survives the EXCEPT ALL, so 1 is in the result.

Review Comment:
   Updated the second sentence to say that PostgreSQL gives the same result.



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