gortiz commented on code in PR #14727:
URL: https://github.com/apache/pinot/pull/14727#discussion_r1905488737


##########
pinot-query-runtime/src/main/java/org/apache/pinot/query/runtime/operator/AggregateOperator.java:
##########
@@ -18,43 +18,53 @@
  */
 package org.apache.pinot.query.runtime.operator;
 
+import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.PriorityQueue;
 import javax.annotation.Nullable;
+import org.apache.calcite.rel.RelFieldCollation;
+import org.apache.pinot.calcite.rel.hint.PinotHintOptions;
 import org.apache.pinot.common.datablock.DataBlock;
 import org.apache.pinot.common.datatable.StatMap;
 import org.apache.pinot.common.request.context.ExpressionContext;
 import org.apache.pinot.common.request.context.FunctionContext;
 import org.apache.pinot.common.utils.DataSchema;
+import org.apache.pinot.common.utils.config.QueryOptionsUtils;
 import org.apache.pinot.core.common.BlockValSet;
 import org.apache.pinot.core.operator.docvalsets.DataBlockValSet;
 import org.apache.pinot.core.operator.docvalsets.FilteredDataBlockValSet;
 import org.apache.pinot.core.operator.docvalsets.FilteredRowBasedBlockValSet;
 import org.apache.pinot.core.operator.docvalsets.RowBasedBlockValSet;
+import org.apache.pinot.core.plan.maker.InstancePlanMakerImplV2;
 import org.apache.pinot.core.query.aggregation.function.AggregationFunction;
 import 
org.apache.pinot.core.query.aggregation.function.AggregationFunctionFactory;
 import 
org.apache.pinot.core.query.aggregation.function.CountAggregationFunction;
 import org.apache.pinot.core.util.DataBlockExtractUtils;
+import org.apache.pinot.core.util.GroupByUtils;
 import org.apache.pinot.query.parser.CalciteRexExpressionParser;
 import org.apache.pinot.query.planner.logical.RexExpression;
 import org.apache.pinot.query.planner.plannode.AggregateNode;
+import org.apache.pinot.query.planner.plannode.PlanNode;
 import org.apache.pinot.query.runtime.blocks.TransferableBlock;
+import org.apache.pinot.query.runtime.operator.utils.SortUtils;
 import org.apache.pinot.query.runtime.plan.OpChainExecutionContext;
 import org.roaringbitmap.RoaringBitmap;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 
 /**
- * AggregateOperator is used to aggregate values over a set of group by keys.
+ * AggregateOperator is used to aggregate values over a (potentially empty) 
set  of group by keys in V2/MSQE.

Review Comment:
   nit: there is an extra space here



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