clintropolis commented on code in PR #15232:
URL: https://github.com/apache/druid/pull/15232#discussion_r1369335570


##########
processing/src/main/java/org/apache/druid/query/groupby/GroupingEngine.java:
##########
@@ -788,11 +788,11 @@ private static boolean 
summaryRowPreconditions(GroupByQuery query)
   private static Iterator<ResultRow> summaryRowIterator(GroupByQuery q)
   {
     List<AggregatorFactory> aggSpec = q.getAggregatorSpecs();
-    Object[] values = new Object[aggSpec.size()];
+    ResultRow resultRow = 
ResultRow.create(q.getResultRowSizeWithPostAggregators());
     for (int i = 0; i < aggSpec.size(); i++) {
-      values[i] = aggSpec.get(i).factorize(new 
AllNullColumnSelectorFactory()).get();
+      resultRow.set(i, aggSpec.get(i).factorize(new 
AllNullColumnSelectorFactory()).get());
     }

Review Comment:
   oh, I think you need to actually compute the postaggs... which is why the 
test is failing in default value mode, see `mergeResults` for an example, 
something like
   ```
     private static Iterator<ResultRow> summaryRowIterator(GroupByQuery q)
     {
       List<AggregatorFactory> aggSpec = q.getAggregatorSpecs();
       ResultRow resultRow = 
ResultRow.create(q.getResultRowSizeWithPostAggregators());
       for (int i = 0; i < aggSpec.size(); i++) {
         resultRow.set(i, aggSpec.get(i).factorize(new 
AllNullColumnSelectorFactory()).get());
       }
       Map<String, Object> map = resultRow.toMap(q);
       for (int i = 0; i < q.getPostAggregatorSpecs().size(); i++) {
         final PostAggregator postAggregator = 
q.getPostAggregatorSpecs().get(i);
         final Object value = postAggregator.compute(map);
   
         resultRow.set(q.getResultRowPostAggregatorStart() + i, value);
         map.put(postAggregator.getName(), value);
       }
       return Collections.singleton(resultRow).iterator();
     }
   ```



##########
processing/src/main/java/org/apache/druid/query/groupby/GroupingEngine.java:
##########
@@ -788,11 +788,11 @@ private static boolean 
summaryRowPreconditions(GroupByQuery query)
   private static Iterator<ResultRow> summaryRowIterator(GroupByQuery q)
   {
     List<AggregatorFactory> aggSpec = q.getAggregatorSpecs();
-    Object[] values = new Object[aggSpec.size()];
+    ResultRow resultRow = 
ResultRow.create(q.getResultRowSizeWithPostAggregators());
     for (int i = 0; i < aggSpec.size(); i++) {
-      values[i] = aggSpec.get(i).factorize(new 
AllNullColumnSelectorFactory()).get();
+      resultRow.set(i, aggSpec.get(i).factorize(new 
AllNullColumnSelectorFactory()).get());
     }

Review Comment:
   oh, I think you need to actually compute the postaggs... which is why the 
test is failing in default value mode, see `mergeResults` for an example, 
something like
   ```
     private static Iterator<ResultRow> summaryRowIterator(GroupByQuery q)
     {
       List<AggregatorFactory> aggSpec = q.getAggregatorSpecs();
       ResultRow resultRow = 
ResultRow.create(q.getResultRowSizeWithPostAggregators());
       for (int i = 0; i < aggSpec.size(); i++) {
         resultRow.set(i, aggSpec.get(i).factorize(new 
AllNullColumnSelectorFactory()).get());
       }
       Map<String, Object> map = resultRow.toMap(q);
       for (int i = 0; i < q.getPostAggregatorSpecs().size(); i++) {
         final PostAggregator postAggregator = 
q.getPostAggregatorSpecs().get(i);
         final Object value = postAggregator.compute(map);
   
         resultRow.set(q.getResultRowPostAggregatorStart() + i, value);
         map.put(postAggregator.getName(), value);
       }
       return Collections.singleton(resultRow).iterator();
     }
   ```
   makes the test pass in both modes for me



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