Github user viirya commented on a diff in the pull request:
    --- Diff: 
    @@ -370,6 +370,12 @@ case class WholeStageCodegenExec(child: SparkPlan) 
extends UnaryExecNode with Co
       override def doExecute(): RDD[InternalRow] = {
         val (ctx, cleanedSource) = doCodeGen()
    +    val existLongFunction = ctx.existTooLongFunction
    +    if (existLongFunction) {
    +      logWarning(s"Function is too long, Whole-stage codegen disabled for 
this plan:\n "
    --- End diff --
    Btw, we can also add log message like `You can change the config 
spark.sql.codegen.MaxFunctionLength to adjust the function length limit`.
    In case users wants to run whole-stage codegen intentionally.

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