marin-ma commented on code in PR #12087:
URL: https://github.com/apache/gluten/pull/12087#discussion_r3316329979


##########
backends-velox/src/main/scala/org/apache/gluten/extension/AppendBatchResizeForShuffleInputAndOutput.scala:
##########
@@ -41,65 +42,59 @@ case class AppendBatchResizeForShuffleInputAndOutput() 
extends Rule[SparkPlan] {
 
     val range = VeloxConfig.get.veloxResizeBatchesShuffleInputOutputRange
     val preferredBatchBytes = VeloxConfig.get.veloxPreferredBatchBytes
+
+    val newPlan = if (resizeBatchesShuffleInputEnabled) {
+      addResizeBatchesForShuffleInput(plan, range.min, range.max, 
preferredBatchBytes)
+    } else {
+      plan
+    }
+
+    val resultPlan = if (resizeBatchesShuffleOutputEnabled) {
+      addResizeBatchesForShuffleOutput(newPlan, range.min, range.max, 
preferredBatchBytes)
+    } else {
+      newPlan
+    }
+
+    resultPlan
+  }
+
+  private def addResizeBatchesForShuffleInput(
+      plan: SparkPlan,
+      min: Int,
+      max: Int,
+      preferredBatchBytes: Long): SparkPlan = {
     plan.transformUp {
       case shuffle: ColumnarShuffleExchangeExec
-          if resizeBatchesShuffleInputEnabled &&
-            shuffle.shuffleWriterType.requiresResizingShuffleInput =>
+          if shuffle.shuffleWriterType.requiresResizingShuffleInput =>
         val appendBatches =
-          VeloxResizeBatchesExec(shuffle.child, range.min, range.max, 
preferredBatchBytes)
+          VeloxResizeBatchesExec(shuffle.child, min, max, preferredBatchBytes)
         shuffle.withNewChildren(Seq(appendBatches))
-      case a @ AQEShuffleReadExec(
-            ShuffleQueryStageExec(_, shuffle: ColumnarShuffleExchangeExec, _),
-            _)
-          if resizeBatchesShuffleOutputEnabled &&
-            shuffle.shuffleWriterType.requiresResizingShuffleOutput =>
-        VeloxResizeBatchesExec(a, range.min, range.max, preferredBatchBytes)
-      case a @ AQEShuffleReadExec(
-            ShuffleQueryStageExec(
-              _,
-              ReusedExchangeExec(_, shuffle: ColumnarShuffleExchangeExec),
-              _),
-            _)
-          if resizeBatchesShuffleOutputEnabled &&
-            shuffle.shuffleWriterType.requiresResizingShuffleOutput =>
-        VeloxResizeBatchesExec(a, range.min, range.max, preferredBatchBytes)
-      // Since it's transformed in a bottom to up order, so we may first 
encounter
-      // ShuffeQueryStageExec, which is transformed to 
VeloxResizeBatchesExec(ShuffeQueryStageExec),
-      // then we see AQEShuffleReadExec
-      case a @ AQEShuffleReadExec(
-            VeloxResizeBatchesExec(
-              s @ ShuffleQueryStageExec(_, shuffle: 
ColumnarShuffleExchangeExec, _),
-              _,
-              _,
-              _),
-            _)
-          if resizeBatchesShuffleOutputEnabled &&
-            shuffle.shuffleWriterType.requiresResizingShuffleOutput =>
-        VeloxResizeBatchesExec(a.copy(child = s), range.min, range.max, 
preferredBatchBytes)
-      case a @ AQEShuffleReadExec(
-            VeloxResizeBatchesExec(
-              s @ ShuffleQueryStageExec(
-                _,
-                ReusedExchangeExec(_, shuffle: ColumnarShuffleExchangeExec),
-                _),
-              _,
-              _,
-              _),
-            _)
-          if resizeBatchesShuffleOutputEnabled &&
-            shuffle.shuffleWriterType.requiresResizingShuffleOutput =>
-        VeloxResizeBatchesExec(a.copy(child = s), range.min, range.max, 
preferredBatchBytes)
-      case s @ ShuffleQueryStageExec(_, shuffle: ColumnarShuffleExchangeExec, 
_)
-          if resizeBatchesShuffleOutputEnabled &&
-            shuffle.shuffleWriterType.requiresResizingShuffleOutput =>
-        VeloxResizeBatchesExec(s, range.min, range.max, preferredBatchBytes)
-      case s @ ShuffleQueryStageExec(
-            _,
-            ReusedExchangeExec(_, shuffle: ColumnarShuffleExchangeExec),
-            _)
-          if resizeBatchesShuffleOutputEnabled &&
-            shuffle.shuffleWriterType.requiresResizingShuffleOutput =>
-        VeloxResizeBatchesExec(s, range.min, range.max, preferredBatchBytes)
+    }
+  }
+
+  private def addResizeBatchesForShuffleOutput(
+      plan: SparkPlan,
+      min: Int,
+      max: Int,
+      preferredBatchBytes: Long): SparkPlan = {
+    plan match {
+      case s: ShuffleQueryStageExec if requiresResizingShuffleOutput(s) =>
+        VeloxResizeBatchesExec(s, min, max, preferredBatchBytes)
+      case a @ AQEShuffleReadExec(s @ ShuffleQueryStageExec(_, _, _), _)
+          if requiresResizingShuffleOutput(s) =>
+        VeloxResizeBatchesExec(a, min, max, preferredBatchBytes)
+      case other =>

Review Comment:
   @wForget The normal entry point for the root node is `case other`. It 
traverses the whole plan until a AQE query stage leaf node (plain 
`ShuffleQueryStageExec`, or `AQEShuffleReadExec` wrapped `AQEShuffleReadExec`) 
is found.



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