LakeShen commented on code in PR #3367:
URL: https://github.com/apache/calcite/pull/3367#discussion_r1307486194


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core/src/test/java/org/apache/calcite/test/RelOptRulesTest.java:
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@@ -2699,6 +2699,35 @@ private void 
checkPushJoinThroughUnionOnRightDoesNotMatchSemiOrAntiJoin(JoinRelT
         .check();
   }
 
+  /** Tests {@link org.apache.calcite.rel.rules.MinusToDistinctRule},

Review Comment:
   > +1, also wondering
   
   @herunkang2018 @tanclary ,I couldn't find a case where quidem was used to 
test the correctness of the optimization rules,could you give me a unit test or 
class to refer to? Thank you very much.



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