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_r391402526
##########
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:
If so, I personally think we'd better fix the generated code of `ExpandExec`
(I'm not sure now that its worth fixing this issue).
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