rubenada commented on code in PR #2829:
URL: https://github.com/apache/calcite/pull/2829#discussion_r895421216


##########
core/src/main/java/org/apache/calcite/sql2rel/RelFieldTrimmer.java:
##########
@@ -297,11 +297,15 @@ protected final TrimResult dispatchTrimFields(
       assert newFieldCount > 0 : "rel has no fields after trim: " + rel;
     }
     if (newRel.equals(rel)) {
-      return result(rel, mapping);
+      return result(rel, mapping, rel);
     }

Review Comment:
   Yes, we can do that.
   In any case, it seems I made a mistake here, I shouldn't have used the 3rd 
parameters in this line, since both rels are the same.



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