PHILO-HE commented on code in PR #7842:
URL: https://github.com/apache/incubator-gluten/pull/7842#discussion_r1865318032


##########
gluten-substrait/src/test/scala/org/apache/gluten/execution/WholeStageTransformerSuite.scala:
##########
@@ -176,25 +176,39 @@ abstract class WholeStageTransformerSuite
       result
   }
 
+  protected def compareResultsAgainstVanillaSpark(
+      sql: String,
+      compareResult: Boolean = true,
+      customCheck: DataFrame => Unit,
+      noFallBack: Boolean = true,
+      cache: Boolean = false): DataFrame = {
+    compareDfResultsAgainstVanillaSpark(
+      () => spark.sql(sql),
+      compareResult,
+      customCheck,
+      noFallBack,
+      cache)
+  }
+
   /**
    * run a query with native engine as well as vanilla spark then compare the 
result set for
    * correctness check
    */
-  protected def compareResultsAgainstVanillaSpark(
-      sqlStr: String,
+  protected def compareDfResultsAgainstVanillaSpark(

Review Comment:
   `Df` means Dataframe? The naming seems not friendly to reader.



##########
gluten-substrait/src/test/scala/org/apache/gluten/execution/WholeStageTransformerSuite.scala:
##########
@@ -176,25 +176,39 @@ abstract class WholeStageTransformerSuite
       result
   }
 
+  protected def compareResultsAgainstVanillaSpark(
+      sql: String,
+      compareResult: Boolean = true,
+      customCheck: DataFrame => Unit,
+      noFallBack: Boolean = true,
+      cache: Boolean = false): DataFrame = {
+    compareDfResultsAgainstVanillaSpark(
+      () => spark.sql(sql),
+      compareResult,
+      customCheck,
+      noFallBack,
+      cache)
+  }
+
   /**
    * run a query with native engine as well as vanilla spark then compare the 
result set for
    * correctness check
    */
-  protected def compareResultsAgainstVanillaSpark(
-      sqlStr: String,
+  protected def compareDfResultsAgainstVanillaSpark(
+      dataframe: () => DataFrame,
       compareResult: Boolean = true,
       customCheck: DataFrame => Unit,
       noFallBack: Boolean = true,
       cache: Boolean = false): DataFrame = {
     var expected: Seq[Row] = null
     withSQLConf(vanillaSparkConfs(): _*) {
-      val df = spark.sql(sqlStr)
+      val df = dataframe()
       expected = df.collect()
     }
-    // By default we will fallabck complex type scan but here we should allow
+    // By default, we will fallabck complex type scan but here we should allow

Review Comment:
   Please also fix typo: `fallabck`.



##########
cpp/velox/substrait/SubstraitToVeloxPlanValidator.h:
##########
@@ -103,9 +106,17 @@ class SubstraitToVeloxPlanValidator {
 
   std::vector<std::string> validateLog_;
 
-  /// Used to get types from advanced extension and validate them.
-  bool validateInputTypes(const ::substrait::extensions::AdvancedExtension& 
extension, std::vector<TypePtr>& types);
+  /// Used to get types from advanced extension and validate them, then 
convert to a Velox type that has arbitrary
+  /// levels of nesting.
+  bool validateInputVeloxType(const 
::substrait::extensions::AdvancedExtension& extension, TypePtr& out);

Review Comment:
   `validateInputVeloxType` makes me feel that the input is velox type. Can we 
use some other name, e.g., `parseToVeloxType`?



##########
gluten-substrait/src/main/scala/org/apache/gluten/extension/columnar/UnionTransformerRule.scala:
##########
@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.gluten.extension.columnar
+
+import org.apache.gluten.GlutenConfig
+import org.apache.gluten.execution.{ColumnarUnionExec, UnionExecTransformer}
+
+import org.apache.spark.sql.catalyst.plans.physical.UnknownPartitioning
+import org.apache.spark.sql.catalyst.rules.Rule
+import org.apache.spark.sql.execution.SparkPlan
+
+/**
+ * Replace ColumnarUnionExec with UnionExecTransformer if possible.
+ *
+ * The rule is not included in 
[[org.apache.gluten.extension.columnar.heuristic.HeuristicTransform]]
+ * or [[org.apache.gluten.extension.columnar.enumerated.EnumeratedTransform]] 
because it relies on
+ * children's output partitioning to be fully provided.
+ */
+case class UnionTransformerRule() extends Rule[SparkPlan] {
+  override def apply(plan: SparkPlan): SparkPlan = {
+    if (!GlutenConfig.getConf.enableNativeUnion) {
+      return plan
+    }
+    plan.transformUp {
+      case plan: ColumnarUnionExec =>
+        val transformer = UnionExecTransformer(plan.children)
+        if (sameNumPartitions(plan.children) && validate(transformer)) {
+          transformer
+        } else {
+          plan
+        }
+    }
+  }
+
+  private def sameNumPartitions(plans: Seq[SparkPlan]): Boolean = {

Review Comment:
   Can we move this into the below `validate` function?



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