amaliujia commented on a change in pull request #2023:
URL: https://github.com/apache/calcite/pull/2023#discussion_r439761102



##########
File path: 
core/src/main/java/org/apache/calcite/adapter/enumerable/EnumerableTraitsUtils.java
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@@ -148,4 +149,53 @@ private static boolean isCollationOnTrivialExpr(
       return null;
     }
   }
+
+  // This function can be reused when a Join's traits pass-down shall only

Review comment:
       Updated to javadoc. Thanks for you suggestion!




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