Github user eatoncys commented on a diff in the pull request:
    --- Diff: 
    @@ -370,6 +370,14 @@ case class WholeStageCodegenExec(child: SparkPlan) 
extends UnaryExecNode with Co
       override def doExecute(): RDD[InternalRow] = {
         val (ctx, cleanedSource) = doCodeGen()
    +    if (ctx.isTooLongGeneratedFunction) {
    +      logWarning("Found too long generated codes and JIT optimization 
might not work, " +
    +        "Whole-stage codegen disabled for this plan, " +
    +        "You can change the config spark.sql.codegen.MaxFunctionLength " +
    +        "to adjust the function length limit:\n "
    +        + s"$treeString")
    +      return child.execute()
    +    }
    --- End diff --
    When we  check "ctx.isTooLongGeneratedFunction" in doExecute, the 
WholeStageCodegenExec node is generated alreay, so there must be 
WholeStageCodegenExec node at this point.

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