adamkennedy commented on code in PR #3757:
URL: https://github.com/apache/calcite/pull/3757#discussion_r1562830081


##########
core/src/main/java/org/apache/calcite/tools/RelBuilder.java:
##########
@@ -2503,7 +2503,7 @@ private RelBuilder 
pruneAggregateInputFieldsAndDeduplicateAggCalls(
           builder.add(project.getRowType().getFieldList().get(i));
         }
         r =
-            project.copy(cluster.traitSet(), project.getInput(), newProjects,
+            project.copy(project.getTraitSet(), project.getInput(), 
newProjects,

Review Comment:
   This is what I was thinking of
   `public RelTraitSet apply(Mappings.TargetMapping mapping)`
   
   And it appears we have a Mappings.TargetMapping available from slightly 
earlier in the function.
   `final Mappings.TargetMapping targetMapping =
               Mappings.target(sourceFieldToTargetFieldMap, 
r.getRowType().getFieldCount(),
                   fieldsUsed.size());`



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