jduo commented on code in PR #3757:
URL: https://github.com/apache/calcite/pull/3757#discussion_r1583542999


##########
core/src/main/java/org/apache/calcite/tools/RelBuilder.java:
##########
@@ -2502,9 +2502,10 @@ private RelBuilder 
pruneAggregateInputFieldsAndDeduplicateAggCalls(
           newProjects.add(project.getProjects().get(i));
           builder.add(project.getRowType().getFieldList().get(i));
         }
+
         r =
-            project.copy(cluster.traitSet(), project.getInput(), newProjects,
-                builder.build());
+            project.copy(project.getTraitSet().apply(targetMapping), 
project.getInput(),

Review Comment:
   I've created https://issues.apache.org/jira/browse/CALCITE-6391 for the 
propagation of apply() calls in RelCompositeTrait. Updating the code to 
reference this.



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