liujiayi771 commented on code in PR #4952:
URL: https://github.com/apache/incubator-gluten/pull/4952#discussion_r1531529571


##########
backends-velox/src/main/scala/io/glutenproject/backendsapi/velox/SparkPlanExecApiImpl.scala:
##########
@@ -659,4 +662,81 @@ class SparkPlanExecApiImpl extends SparkPlanExecApi {
   ): GenerateExecTransformerBase = {
     GenerateExecTransformer(generator, requiredChildOutput, outer, 
generatorOutput, child)
   }
+
+  override def genPreProjectForGenerate(generate: GenerateExec): SparkPlan = {
+    if (supportsGenerate(generate)) {
+      val newGeneratorChild = 
generate.generator.asInstanceOf[UnaryExpression].child match {
+        case attr: Attribute => attr
+        case expr @ (Literal(_, _) | CreateMap(_, _) | CreateArray(_, _)) =>
+          Alias(expr, generatePreAliasName)()
+        case other =>
+          throw new UnsupportedOperationException(

Review Comment:
   I find that in your initial commit, the main logic codes are put in pull-out 
rule. Why do you move it to `SparkPlanExecApi` now? I think it’s better for 
`SparkPlanExecApi` to only control whether it's necessary to pull out.



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