jduo commented on code in PR #3757:
URL: https://github.com/apache/calcite/pull/3757#discussion_r1566047599
##########
core/src/main/java/org/apache/calcite/tools/RelBuilder.java:
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@@ -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:
It looks like it maps to the underlying project to me.
The same fields referenced in building the Mapping are used to construct the
newProjects variable (the list of RexNodes in the new projection).
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