Victoria Markman created DRILL-4012:
---------------------------------------

             Summary: Limit 0 on top of query with kvg/flatten results in assert
                 Key: DRILL-4012
                 URL: https://issues.apache.org/jira/browse/DRILL-4012
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Data Types
            Reporter: Victoria Markman


missing-map.json
{code}
{
    "id": 1,
    "m": {"a":1,"b":2}
}
{
    "id": 2
}
{
    "id": 3,
    "m": {"c":3,"d":4}
}
{code}

'limit 0' results in an assert:
{code}
0: jdbc:drill:schema=dfs> select * from (select id, flatten(kvgen(m)) from 
`missing-map.json`) limit 0;
Error: SYSTEM ERROR: ClassCastException: Cannot cast 
org.apache.drill.exec.vector.NullableIntVector to 
org.apache.drill.exec.vector.complex.RepeatedValueVector
Fragment 0:0
[Error Id: 046bb4d4-2c54-43ab-9577-cf21542ff8ef on atsqa4-133.qa.lab:31010] 
(state=,code=0)
{code}

'limit 1' works:
{code}
0: jdbc:drill:schema=dfs> select * from (select id, flatten(kvgen(m)) from 
`missing-map.json`) limit 1;
+-----+------------------------+
| id  |         EXPR$1         |
+-----+------------------------+
| 1   | {"key":"a","value":1}  |
+-----+------------------------+
1 row selected (0.247 seconds)
{code}

No limit, just in subquery: works
{code}
0: jdbc:drill:schema=dfs> select * from (select id, flatten(kvgen(m)) from 
`json_kvgenflatten/missing-map.json`);
+-----+------------------------+
| id  |         EXPR$1         |
+-----+------------------------+
| 1   | {"key":"a","value":1}  |
| 1   | {"key":"b","value":2}  |
| 3   | {"key":"c","value":3}  |
| 3   | {"key":"d","value":4}  |
+-----+------------------------+
4 rows selected (0.247 seconds)
{code}

drillbit.log
{code}
2015-11-03 15:23:20,943 [29c72e96-c9f6-9fce-ecf1-14eaa145f72b:foreman] INFO  
o.a.d.e.s.schedule.BlockMapBuilder - Failure finding Drillbit running on host 
atsqa4-136.qa.lab.  Skipping affinity to that host.
2015-11-03 15:23:20,944 [29c72e96-c9f6-9fce-ecf1-14eaa145f72b:foreman] INFO  
o.a.d.e.s.schedule.BlockMapBuilder - Failure finding Drillbit running on host 
atsqa4-134.qa.lab.  Skipping affinity to that host.
2015-11-03 15:23:20,944 [29c72e96-c9f6-9fce-ecf1-14eaa145f72b:foreman] INFO  
o.a.d.e.s.schedule.BlockMapBuilder - Get block maps: Executed 1 out of 1 using 
1 threads. Time: 1ms total, 1.530719ms avg, 1ms max.
2015-11-03 15:23:20,944 [29c72e96-c9f6-9fce-ecf1-14eaa145f72b:foreman] INFO  
o.a.d.e.s.schedule.BlockMapBuilder - Get block maps: Executed 1 out of 1 using 
1 threads. Earliest start: 1.744000 μs, Latest start: 1.744000 μs, Average 
start: 1.744000 μs .
2015-11-03 15:23:20,968 [29c72e96-c9f6-9fce-ecf1-14eaa145f72b:frag:0:0] INFO  
o.a.d.e.w.fragment.FragmentExecutor - 29c72e96-c9f6-9fce-ecf1-14eaa145f72b:0:0: 
State change requested AWAITING_ALLOCATION --> RUNNING
2015-11-03 15:23:20,968 [29c72e96-c9f6-9fce-ecf1-14eaa145f72b:frag:0:0] INFO  
o.a.d.e.w.f.FragmentStatusReporter - 29c72e96-c9f6-9fce-ecf1-14eaa145f72b:0:0: 
State to report: RUNNING
2015-11-03 15:23:20,974 [29c72e96-c9f6-9fce-ecf1-14eaa145f72b:frag:0:0] WARN  
o.a.d.e.e.ExpressionTreeMaterializer - Unable to find value vector of path 
`EXPR$3`, returning null instance.
2015-11-03 15:23:20,975 [29c72e96-c9f6-9fce-ecf1-14eaa145f72b:frag:0:0] WARN  
o.a.d.e.e.ExpressionTreeMaterializer - Unable to find value vector of path 
`EXPR$3`, returning null instance.
2015-11-03 15:23:20,976 [29c72e96-c9f6-9fce-ecf1-14eaa145f72b:frag:0:0] INFO  
o.a.d.e.w.fragment.FragmentExecutor - 29c72e96-c9f6-9fce-ecf1-14eaa145f72b:0:0: 
State change requested RUNNING --> FAILED
2015-11-03 15:23:20,976 [29c72e96-c9f6-9fce-ecf1-14eaa145f72b:frag:0:0] INFO  
o.a.d.e.w.fragment.FragmentExecutor - 29c72e96-c9f6-9fce-ecf1-14eaa145f72b:0:0: 
State change requested FAILED --> FINISHED
2015-11-03 15:23:20,978 [29c72e96-c9f6-9fce-ecf1-14eaa145f72b:frag:0:0] ERROR 
o.a.d.e.w.fragment.FragmentExecutor - SYSTEM ERROR: ClassCastException: Cannot 
cast org.apache.drill.exec.vector.NullableIntVector to 
org.apache.drill.exec.vector.complex.RepeatedValueVector

Fragment 0:0

[Error Id: c82c7f59-4dad-47ad-8901-5a2261c81279 on atsqa4-133.qa.lab:31010]
org.apache.drill.common.exceptions.UserException: SYSTEM ERROR: 
ClassCastException: Cannot cast org.apache.drill.exec.vector.NullableIntVector 
to org.apache.drill.exec.vector.complex.RepeatedValueVector

Fragment 0:0
[Error Id: c82c7f59-4dad-47ad-8901-5a2261c81279 on atsqa4-133.qa.lab:31010]
        at 
org.apache.drill.common.exceptions.UserException$Builder.build(UserException.java:534)
 ~[drill-common-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.work.fragment.FragmentExecutor.sendFinalState(FragmentExecutor.java:323)
 [drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.work.fragment.FragmentExecutor.cleanup(FragmentExecutor.java:178)
 [drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:292)
 [drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.common.SelfCleaningRunnable.run(SelfCleaningRunnable.java:38) 
[drill-common-1.2.0.jar:1.2.0]
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
[na:1.7.0_71]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
[na:1.7.0_71]
        at java.lang.Thread.run(Thread.java:745) [na:1.7.0_71]
Caused by: java.lang.ClassCastException: Cannot cast 
org.apache.drill.exec.vector.NullableIntVector to 
org.apache.drill.exec.vector.complex.RepeatedValueVector
        at java.lang.Class.cast(Class.java:3176) ~[na:1.7.0_71]
        at 
org.apache.drill.exec.physical.impl.flatten.FlattenRecordBatch.getFlattenFieldTransferPair(FlattenRecordBatch.java:270)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.physical.impl.flatten.FlattenRecordBatch.setupNewSchema(FlattenRecordBatch.java:292)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractSingleRecordBatch.innerNext(AbstractSingleRecordBatch.java:78)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.physical.impl.flatten.FlattenRecordBatch.innerNext(FlattenRecordBatch.java:120)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:147)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:104)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:94)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractSingleRecordBatch.innerNext(AbstractSingleRecordBatch.java:51)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.innerNext(ProjectRecordBatch.java:129)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:147)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:104)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:94)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractSingleRecordBatch.innerNext(AbstractSingleRecordBatch.java:51)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.physical.impl.limit.LimitRecordBatch.innerNext(LimitRecordBatch.java:115)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:147)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:104)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:94)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractSingleRecordBatch.innerNext(AbstractSingleRecordBatch.java:51)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.physical.impl.svremover.RemovingRecordBatch.innerNext(RemovingRecordBatch.java:94)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:147)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:104)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:94)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractSingleRecordBatch.innerNext(AbstractSingleRecordBatch.java:51)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.innerNext(ProjectRecordBatch.java:129)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:147)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:83) 
~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.innerNext(ScreenCreator.java:80)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:73) 
~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.work.fragment.FragmentExecutor$1.run(FragmentExecutor.java:258)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at 
org.apache.drill.exec.work.fragment.FragmentExecutor$1.run(FragmentExecutor.java:252)
 ~[drill-java-exec-1.2.0.jar:1.2.0]
        at java.security.AccessController.doPrivileged(Native Method) 
~[na:1.7.0_71]
        at javax.security.auth.Subject.doAs(Subject.java:415) ~[na:1.7.0_71]
        at 
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1566)
 ~[hadoop-common-2.5.1-mapr-1503.jar:na]
        at 
org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:252)
 [drill-java-exec-1.2.0.jar:1.2.0]
        ... 4 common frames omitted
2015-11-03 15:23:20,998 [BitServer-4] WARN  o.a.drill.exec.work.foreman.Foreman 
- Dropping request to move to COMPLETED state as query is already at FAILED 
state (which is terminal).
2015-11-03 15:23:20,998 [BitServer-4] WARN  o.a.d.e.w.b.ControlMessageHandler - 
Dropping request to cancel fragment. 29c72e96-c9f6-9fce-ecf1-14eaa145f72b:0:0 
does not exist.
{code}

I'm not sure about priority of this issue, 'limit 0' is generated by tools 
usually ... Leaving  it as "Major" for now.



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