Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/18810#discussion_r132375138 --- 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 -- We can check if there is a `WholeStageCodegenExec` node in the physical plan of the query. `WholeStageCodegenSuite` has few examples you can take a look.
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