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https://issues.apache.org/jira/browse/DRILL-5197?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15824001#comment-15824001
]
Muhammad Gelbana commented on DRILL-5197:
-----------------------------------------
[~sharnyk], how is this applied to the above query ? If I replace the
{code:sql}THEN `tname`.`full_name`{code} statement with a literal value, the
query runs without errors. Why is this considered a different case from
returning a column value ?
> CASE statement fails due to error: Unable to get value vector class for minor
> type [NULL] and mode [OPTIONAL]
> -------------------------------------------------------------------------------------------------------------
>
> Key: DRILL-5197
> URL: https://issues.apache.org/jira/browse/DRILL-5197
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Data Types
> Affects Versions: 1.9.0
> Reporter: Muhammad Gelbana
>
> The following query fails for no obvious reason
> {code:sql}
> 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`
> {code}
> If the `THEN `tname`.`full_name`` statements is changed to `THEN 'ABC'` the
> error does not occur.
> Thrown exception
> {noformat}
> [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
> {noformat}
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