[GitHub] [spark] maropu commented on a change in pull request #27872: [SPARK-31115][SQL] Detect known Janino bug janino-compiler/janino#113 and apply workaround automatically as a fail-back via avoid using switch statement in generated code

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maropu commented on a change in pull request #27872: [SPARK-31115][SQL] Detect known Janino bug janino-compiler/janino#113 and apply workaround automatically as a fail-back via avoid using switch statement in generated code
URL: https://github.com/apache/spark/pull/27872#discussion_r391333502
 
 

 ##########
 File path: sql/core/src/main/scala/org/apache/spark/sql/execution/WholeStageCodegenExec.scala
 ##########
 @@ -688,11 +692,56 @@ case class WholeStageCodegenExec(child: SparkPlan)(val codegenStageId: Int)
     child.executeColumnar()
   }
 
-  override def doExecute(): RDD[InternalRow] = {
+  private type CompileResult = (CodegenContext, CodeAndComment, GeneratedClass, ByteCodeStats)
+
+  /**
+   * NOTE: This method handles the known Janino bug:
+   * - https://github.com/janino-compiler/janino/issues/113
+   *
+   * It tries to generate code and compile in normal path. If the compilation fails and the reason
+   * is due to the known bug, it generates workaround code via touching flag in CodegenContext and
+   * compile again.
+   */
+  private def doGenCodeAndCompile(): CompileResult = {
 
 Review comment:
   How do we handle the non-whole stage codegen case? e.g., `GenerateMutableProjection` via `CodeGeneratorWithInterpretedFallback`?

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