[ 
https://issues.apache.org/jira/browse/SPARK-19959?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Wenchen Fan resolved SPARK-19959.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 2.2.0
                   2.0.3
                   2.1.1

Issue resolved by pull request 17302
[https://github.com/apache/spark/pull/17302]

> df[java.lang.Long].collect throws NullPointerException if df includes null
> --------------------------------------------------------------------------
>
>                 Key: SPARK-19959
>                 URL: https://issues.apache.org/jira/browse/SPARK-19959
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Kazuaki Ishizaki
>             Fix For: 2.1.1, 2.0.3, 2.2.0
>
>
> The following program throws {{NullPointerException}} during the execution of 
> Java code generated by the wholestage codegen.
> {code:java}
> sparkContext.parallelize(Seq[java.lang.Long](0L, null, 2L), 1).toDF.collect
> {code}
> {code}
> Caused by: java.lang.NullPointerException
>       at 
> org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.processNext(generated.java:37)
>       at 
> org.apache.spark.sql.execution.BufferedRowIterator.hasNext(BufferedRowIterator.java:43)
>       at 
> org.apache.spark.sql.execution.WholeStageCodegenExec$$anonfun$8$$anon$1.hasNext(WholeStageCodegenExec.scala:394)
>       at 
> org.apache.spark.sql.execution.SparkPlan$$anonfun$2.apply(SparkPlan.scala:231)
>       at 
> org.apache.spark.sql.execution.SparkPlan$$anonfun$2.apply(SparkPlan.scala:225)
>       at 
> org.apache.spark.rdd.RDD$$anonfun$mapPartitionsInternal$1$$anonfun$apply$25.apply(RDD.scala:827)
>       at 
> org.apache.spark.rdd.RDD$$anonfun$mapPartitionsInternal$1$$anonfun$apply$25.apply(RDD.scala:827)
>       at 
> org.apache.spark.rdd.MapPartitionsRDD.compute(MapPartitionsRDD.scala:38)
>       at org.apache.spark.rdd.RDD.computeOrReadCheckpoint(RDD.scala:323)
>       at org.apache.spark.rdd.RDD.iterator(RDD.scala:287)
>       at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87)
>       at org.apache.spark.scheduler.Task.run(Task.scala:108)
>       at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:317)
>       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)
> {code}



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