[jira] [Created] (SPARK-19509) [SQL]GROUPING SETS throws NullPointerException when use a CASE WHEN statement

["StanZhai (JIRA)" <ji...@apache.org>]

StanZhai created SPARK-19509:
--------------------------------

             Summary: [SQL]GROUPING SETS throws NullPointerException when use a CASE WHEN statement
                 Key: SPARK-19509
                 URL: https://issues.apache.org/jira/browse/SPARK-19509
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.1.0
            Reporter: StanZhai
            Priority: Critical


To reproduce the issue a CASE WHEN statement must be return a STRING value and the grouping sets must be empty.

{code:sql|title=A simple case}
select case "0" when "0" then "a" else "b" end
from tb
group by case "0" when "0" then "a" else "b" end
grouping sets (())
{code}

{code:title=Exception}
Caused by: java.lang.NullPointerException
	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:377)
	at scala.collection.Iterator$$anon$11.hasNext(Iterator.scala:408)
	at org.apache.spark.shuffle.sort.BypassMergeSortShuffleWriter.write(BypassMergeSortShuffleWriter.java:126)
	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:96)
	at org.apache.spark.scheduler.ShuffleMapTask.runTask(ShuffleMapTask.scala:53)
	at org.apache.spark.scheduler.Task.run(Task.scala:99)
	at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:282)
	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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