Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/18810#discussion_r131575786
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/WholeStageCodegenExec.scala
 ---
    @@ -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 --
    
    This could be very big. Please follow what did in 
https://github.com/apache/spark/pull/18658


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