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

    https://github.com/apache/spark/pull/18810#discussion_r132508826
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/WholeStageCodegenExec.scala
 ---
    @@ -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 --
    
    There are multiple ways to verify it. One of the solution is using SQL 
metrics. 


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