Github user eatoncys 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 "
    +        + s"$treeString")
    --- End diff --
    @gatorsmile , thank you for review, the treeString not contains the code, 
it only contains the tree string of the Physical plan like below:
    *HashAggregate(keys=[k1#2395L, k2#2396, k3#2397], 
    +- *Project [id#2392L, (id#2392L & 1023) AS k1#2395L, cast((id#2392L & 
1023) as double) AS k2#2396...
    +- *Range (0, 655360, step=1, splits=1)
    So, I think it will not be very big.

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