diff --git a/spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala b/spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala
index 56b66909e..b27fa3a75 100644
--- a/spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala
+++ b/spark/src/main/scala/org/apache/comet/serde/QueryPlanSerde.scala
@@ -1783,6 +1783,13 @@ object QueryPlanSerde extends Logging with ShimQueryPlanSerde {
         if (aggregateExpressions.isEmpty) {
           val hashAggBuilder = OperatorOuterClass.HashAggregate.newBuilder()
           hashAggBuilder.addAllGroupingExprs(groupingExprs.map(_.get).asJava)
+          val attributes = groupingExpressions.map(_.toAttribute) ++ aggregateAttributes
+          val resultExprs = resultExpressions.map(exprToProto(_, attributes))
+          if (resultExprs.exists(_.isEmpty)) {
+            emitWarning(s"Unsupported result expressions found in: ${resultExpressions}")
+            return None
+          }
+          hashAggBuilder.addAllResultExprs(resultExprs.map(_.get).asJava)
           Some(result.setHashAgg(hashAggBuilder).build())
         } else {
           val modes = aggregateExpressions.map(_.mode).distinct
diff --git a/spark/src/test/scala/org/apache/comet/exec/CometAggregateSuite.scala b/spark/src/test/scala/org/apache/comet/exec/CometAggregateSuite.scala
index bc645cb6a..8a68a925e 100644
--- a/spark/src/test/scala/org/apache/comet/exec/CometAggregateSuite.scala
+++ b/spark/src/test/scala/org/apache/comet/exec/CometAggregateSuite.scala
@@ -40,6 +40,22 @@ import org.apache.comet.CometSparkSessionExtensions.isSpark34Plus
 class CometAggregateSuite extends CometTestBase with AdaptiveSparkPlanHelper {
   import testImplicits._
 
+  test("Aggregation without aggregate expressions should use correct result expressions") {
+    withSQLConf(
+      CometConf.COMET_ENABLED.key -> "true",
+      CometConf.COMET_EXEC_SHUFFLE_ENABLED.key -> "true",
+      CometConf.COMET_COLUMNAR_SHUFFLE_ENABLED.key -> "true") {
+      withTempDir { dir =>
+        val path = new Path(dir.toURI.toString, "test")
+        makeParquetFile(path, 10000, 10, false)
+        withParquetTable(path.toUri.toString, "tbl") {
+          val df = sql("SELECT _g5 FROM tbl GROUP BY _g1, _g2, _g3, _g4, _g5")
+          checkSparkAnswer(df)
+        }
+      }
+    }
+  }
+
   test("Final aggregation should not bind to the input of partial aggregation") {
     withSQLConf(
       CometConf.COMET_ENABLED.key -> "true",