koert kuipers created SPARK-18651:
-------------------------------------
Summary: KeyValueGroupedDataset[K, V].reduceGroups cannot handle
primitive for V
Key: SPARK-18651
URL: https://issues.apache.org/jira/browse/SPARK-18651
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.0.2
Reporter: koert kuipers
run:
{noformat}
val df = Seq(1, 2, 3)
.toDS
.groupByKey(x => x)
.reduceGroups(_ + _)
df.show
{noformat}
result:
{noformat}
org.apache.spark.SparkException: Job aborted due to stage failure: Task 2 in
stage 143.0 failed 1 times, most recent failure: Lost task 2.0 in stage 143.0
(TID 514, localhost): java.lang.NullPointerException
at
org.apache.spark.sql.catalyst.expressions.GeneratedClass$SpecificUnsafeProjection.apply(Unknown
Source)
at
org.apache.spark.sql.execution.aggregate.HashAggregateExec.createHashMap(HashAggregateExec.scala:296)
at
org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.agg_doAggregateWithKeys$(Unknown
Source)
at
org.apache.spark.sql.catalyst.expressions.GeneratedClass$GeneratedIterator.processNext(Unknown
Source)
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:370)
at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
at
org.apache.spark.shuffle.sort.BypassMergeSortShuffleWriter.write(BypassMergeSortShuffleWriter.java:125)
at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:79)
at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:47)
at org.apache.spark.scheduler.Task.run(Task.scala:86)
at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:274)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
{noformat}
the issue is the null in ReduceAggregator.zero
for a primitive type this null leads to the NPE. instead for primitive types we
should do a dummy/default value (0 for int, false for boolean, etc.)
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