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https://issues.apache.org/jira/browse/DRILL-1911?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sean Hsuan-Yi Chu resolved DRILL-1911.
--------------------------------------
Resolution: Fixed
> Querying same field multiple times with different case would hit memory leak
> and return incorrect result.
> ----------------------------------------------------------------------------------------------------------
>
> Key: DRILL-1911
> URL: https://issues.apache.org/jira/browse/DRILL-1911
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Relational Operators
> Reporter: Jinfeng Ni
> Assignee: Sean Hsuan-Yi Chu
> Fix For: 0.8.0
>
>
> git.commit.id.abbrev=309e1be
> If query the same field twice, with different case, Drill will throw memory
> assertion error.
> select employee_id, Employee_id from cp.`employee.json` limit 2;
> +-------------+
> | employee_id |
> +-------------+
> | 1 |
> | 2 |
> Query failed: Query failed: Failure while running fragment., Attempted to
> close accountor with 2 buffer(s) still allocatedfor QueryId:
> 2b5cc8eb-2817-aadb-e0fa-49272796592a, MajorFragmentId: 0, MinorFragmentId: 0.
> Total 1 allocation(s) of byte size(s): 4096, at stack location:
>
> org.apache.drill.exec.memory.TopLevelAllocator$ChildAllocator.buffer(TopLevelAllocator.java:212)
>
> org.apache.drill.exec.vector.UInt1Vector.allocateNewSafe(UInt1Vector.java:137)
>
> org.apache.drill.exec.vector.NullableBigIntVector.allocateNewSafe(NullableBigIntVector.java:173)
>
> org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.doAlloc(ProjectRecordBatch.java:229)
>
> org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.doWork(ProjectRecordBatch.java:167)
>
> org.apache.drill.exec.record.AbstractSingleRecordBatch.innerNext(AbstractSingleRecordBatch.java:93)
>
> org.apache.drill.exec.physical.impl.project.ProjectRecordBatch.innerNext(ProjectRecordBatch.java:132)
>
> org.apache.drill.exec.record.AbstractRecordBatch.next(AbstractRecordBatch.java:142)
>
> org.apache.drill.exec.physical.impl.validate.IteratorValidatorBatchIterator.next(IteratorValidatorBatchIterator.java:118)
>
> org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:67)
>
> org.apache.drill.exec.physical.impl.ScreenCreator$ScreenRoot.innerNext(ScreenCreator.java:97)
>
> org.apache.drill.exec.physical.impl.BaseRootExec.next(BaseRootExec.java:57)
>
> org.apache.drill.exec.work.fragment.FragmentExecutor.run(FragmentExecutor.java:114)
>
> org.apache.drill.exec.work.WorkManager$RunnableWrapper.run(WorkManager.java:254)
>
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> java.lang.Thread.run(Thread.java:744)
> Also, notice that the query result only contains one field; the second field
> is missing.
> The plan looks fine.
> Drill Physical :
> 00-00 Screen: rowcount = 463.0, cumulative cost = {1900.3 rows, 996.3 cpu,
> 0.0 io, 0.0 network, 0.0 memory}, id = 103
> 00-01 Project(employee_id=[$0], Employee_id=[$1]): rowcount = 463.0,
> cumulative cost = {1854.0 rows, 950.0 cpu, 0.0 io, 0.0 network, 0.0 memory},
> id = 102
> 00-02 SelectionVectorRemover: rowcount = 463.0, cumulative cost =
> {1391.0 rows, 942.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 101
> 00-03 Limit(fetch=[2]): rowcount = 463.0, cumulative cost = {928.0
> rows, 479.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 100
> 00-04 Project(employee_id=[$0], Employee_id=[$0]): rowcount =
> 463.0, cumulative cost = {926.0 rows, 471.0 cpu, 0.0 io, 0.0 network, 0.0
> memory}, id = 99
> 00-05 Scan(groupscan=[EasyGroupScan
> [selectionRoot=/employee.json, numFiles=1, columns=[`employee_id`],
> files=[/employee.json]]]): rowcount = 463.0, cumulative cost = {463.0 rows,
> 463.0 cpu, 0.0 io, 0.0 network, 0.0 memory}, id = 98
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