tarun11Mavani commented on code in PR #16113:
URL: https://github.com/apache/pinot/pull/16113#discussion_r2151774446


##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/recordtransformer/ComplexTypeTransformer.java:
##########
@@ -179,20 +184,25 @@ public List<String> getInputColumns() {
   @Override
   public GenericRow transform(GenericRow record) {
     try {
-      GenericRow originalRow = _fieldsToUnnest.isEmpty() ? null : 
record.copy(_fieldsToUnnest);
-      flattenMap(record, new 
ArrayList<>(record.getFieldToValueMap().keySet()));
-      for (String field : _fieldsToUnnest) {
-        unnestCollection(record, field);
-      }
-      Object unnestedRows = record.getValue(GenericRow.MULTIPLE_RECORDS_KEY);
-      if (originalRow != null && unnestedRows instanceof Collection) {
-        for (GenericRow unnestedRow : (Collection<GenericRow>) unnestedRows) {
-          for (String field : _fieldsToUnnest) {
-            unnestedRow.putValue(field, originalRow.getValue(field));
+      if (_retainOriginalFieldInUnnest) {

Review Comment:
   I think this will be a backward incompatible change. The existing users will 
have to modify their table config to add this field if they want to retain the 
original fields.  
   It would be good to call out the impact of this. 



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