Github user ericl commented on the issue: https://github.com/apache/spark/pull/13569 Yeah I'm looking into how to reproduce this in a unit test. It seems we have to go through `DeserializeToObjectExec` to reproduce the npe: ``` Execution 'q9-v1.4' failed: Job aborted due to stage failure: Task 0 in stage 146.0 failed 4 times, most recent failure: Lost task 0.3 in stage 146.0 (TID 48828, 10.0.206.208): java.lang.NullPointerException at org.apache.spark.sql.execution.ScalarSubquery.dataType(subquery.scala:45) at org.apache.spark.sql.catalyst.expressions.CaseWhenBase.dataType(conditionalExpressions.scala:103) at org.apache.spark.sql.catalyst.expressions.Alias.toAttribute(namedExpressions.scala:165) at org.apache.spark.sql.execution.ProjectExec$$anonfun$output$1.apply(basicPhysicalOperators.scala:33) at org.apache.spark.sql.execution.ProjectExec$$anonfun$output$1.apply(basicPhysicalOperators.scala:33) at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244) at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244) at scala.collection.immutable.List.foreach(List.scala:318) at scala.collection.TraversableLike$class.map(TraversableLike.scala:244) at scala.collection.AbstractTraversable.map(Traversable.scala:105) at org.apache.spark.sql.execution.ProjectExec.output(basicPhysicalOperators.scala:33) at org.apache.spark.sql.execution.WholeStageCodegenExec.output(WholeStageCodegenExec.scala:291) at org.apache.spark.sql.execution.DeserializeToObjectExec$$anonfun$2.apply(objects.scala:85) at org.apache.spark.sql.execution.DeserializeToObjectExec$$anonfun$2.apply(objects.scala:84) at org.apache.spark.rdd.RDD$$anonfun$mapPartitionsInternal$1$$anonfun$apply$24.apply(RDD.scala:775) at org.apache.spark.rdd.RDD$$anonfun$mapPartitionsInternal$1$$anonfun$apply$24.apply(RDD.scala:775) at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38) at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:318) at org.apache.spark.rdd.RDD.iterator(RDD.scala:282) at org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38) at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:318) at org.apache.spark.rdd.RDD.iterator(RDD.scala:282) at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:70) at org.apache.spark.scheduler.Task.run(Task.scala:85) at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:274) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) ```
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