[DRILL-5197] CASE statement fails due to error: Unable to get value vector class for minor type [NULL] and mode [OPTIONAL]

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Not A Bug
• Affects Version/s: 1.9.0
• Component/s: Execution - Data Types
• Assignee: Unassigned
• Reporter: Mohamed Mohsen
• Created: 15/Jan/17 18:33
• Updated: 27/Jan/17 13:04
• Resolved: 17/Jan/17 05:51

Description

The following query fails for no obvious reason

SELECT
   CASE
      WHEN `tname`.`full_name` = 'ABC' 
      THEN
         ( 
         CASE
            WHEN `tname`.`full_name` = 'ABC' 
            THEN
               (
                  CASE
                     WHEN `tname`.`full_name` = ' ' 
                     THEN
                        (
                           CASE
                              WHEN `tname`.`full_name` = 'ABC' 
                              THEN `tname`.`full_name` 
                              ELSE NULL 
                           END
                        )
                        ELSE NULL 
                  END
               )
               ELSE NULL 
         END
         )
         WHEN `tname`.`full_name` = 'ABC' 
         THEN NULL 
         ELSE NULL 
   END
FROM
   cp.`employee.json` `tname`

If the `THEN `tname`.`full_name`` statements is changed to `THEN 'ABC'` the error does not occur.

Thrown exception

[Error Id: e75fd0fe-132b-4eb4-b2e8-7b34dc39657e on mgelbana-incorta:31010]
	at org.apache.drill.common.exceptions.UserException$Builder.build(UserException.java:543) ~[drill-common-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.work.fragment.FragmentExecutor.sendFinalState(FragmentExecutor.java:293) [drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.work.fragment.FragmentExecutor.cleanup(FragmentExecutor.java:160) [drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:262) [drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.common.SelfCleaningRunnable.run(SelfCleaningRunnable.java:38) [drill-common-1.9.0.jar:1.9.0]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_111]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_111]
	at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111]
Caused by: java.lang.UnsupportedOperationException: Unable to get value vector class for minor type [NULL] and mode [OPTIONAL]
	at org.apache.drill.exec.expr.BasicTypeHelper.getValueVectorClass(BasicTypeHelper.java:441) ~[vector-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.record.VectorContainer.addOrGet(VectorContainer.java:123) ~[drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.setupNewSchema(ProjectRecordBatch.java:463) ~[drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.record.AbstractSingleRecordBatch.innerNext(AbstractSingleRecordBatch.java:78) ~[drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.innerNext(ProjectRecordBatch.java:135) ~[drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:162) ~[drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:104) ~[drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.innerNext(ScreenCreator.java:81) ~[drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:94) ~[drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.work.fragment.FragmentExecutor$1.run(FragmentExecutor.java:232) ~[drill-java-exec-1.9.0.jar:1.9.0]
	at org.apache.drill.exec.work.fragment.FragmentExecutor$1.run(FragmentExecutor.java:226) ~[drill-java-exec-1.9.0.jar:1.9.0]
	at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_111]
	at javax.security.auth.Subject.doAs(Subject.java:422) ~[na:1.8.0_111]
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657) ~[hadoop-common-2.7.1.jar:na]
	at org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:226) [drill-java-exec-1.9.0.jar:1.9.0]
	... 4 common frames omitted

Issue Links

• duplicates: DRILL-4936 case expression when true then null, fails